Thanks sooo much! Your video was awesome! I'm a single mother who doesn't have extra money and your video showed me exactly how to replace the control module, down to needing a 9/32 socket. I bought the part on ebay for $64 and it took me 20 minutes from start to finish. Thanks again!
Ordered my part from Amazon on Saturday, received it this morning. Just finished it took about twenty minutes works great. Now my granddaughter won't be cold this winter. Of course today it was 72 degrees. I have a 2004 Tahoe thanks.
Spitfire, thank you for a complete and easy to follow video. It really gave me confidence to jump in and make this repair. I had my laptop out in the garage and would stop and refer to the video...and the problem is fixed. Again, great job and thank you!
I just want to say thank you for posting this video, it's a great step by step procedure for replacing the rear aux heating module, it was a breeze, and the best part is that it fixed the problem, I now have rear heat. Thank you again!
Thanks so much for the post. I have 2004 chevy tahoe and my issue was the front vents were blowing cold air but the back vents were blowing hot air. The part number you recommended fixed it right up, thanks again...
05 yukon. Gm suks electrical issues everywhere. All my heater controls have had problems including the heater digital control box i replaced with a junkyard box and it performs exactly the same way, Only heats the vehicle if I set it at 90°. Now my rear heat does not work for the second year in a row in the middle of the bitter cold winter and I decided to chop a hole in the area where you showed the actuator is located and I'm going to turn the flap door to the heat position and put a screw to hold it. Forever. My AC doesn't work anyway.
I have a 2002 Chevy Tahoe The blower in rear stop working. I followed your instructions. Instead of replacing it. I tap it and it works. I will replace it soon but as long I don't put the controller on high. Thank you.
Thank you for this, my 05 yukon has this issue started last year, I love the rear heat as a neck warmer and not being able to use rear heat really sucks lol
The rear fuse is the RR HVAC. its actually the 30 amp fuse. At least on my Cadillac escalade. the 10 amp fuse runs the front. I was getting A/C in the back when I wanted Heat. The actuator (next to the module that's replaced in this video) was not switching from AC to heat. I replaced it, the actuator reset by switching back and forth but then now it stays on cold again. Going to replace the module next. Good video, some people might have to replace both to get it working.
Great video. I've been driving around for at least 3 years with no heat in the back of my truck. This winter the kids have been complaining more than normal, so I figured it was time to fix it. Swapped out the module, and at first, I still couldn't get any warm air in the back. I tried pulling the fuse several times, and nothing would work. After another Google search, I found a thread somewhere that mentions pulling the 60 amp VSES/ECAS fuse under the hood. That should be for the stability control, so I couldn't imagine it would work. IT DID!!! Now I have hot air, and the kids are happy. Thanks!
Glad to hear that you finally got it working. The reason I fixed mine was because we had a new born and couldn't drive around without heat! Thanks for watching, I appreciate it!
Spitfire thank you for the informative and $$ saving post, I followed your instructions to spec, after buttoning all the trim/panels back together I still am getting cold air! I have pulled the fuse turned the truck to ON for 1min interval shut truck off replaced fuse at least 5x with the truck at normal operating temperature. Blowing plenty hot in the cockpit but 2nd and 3rd row remain cold. I attempted to pull the VSES 60amp fuse that Mike refers to above. In my attempt it would not come loose and ended up crushing some of the plastic around the fuse with the pliers. Mike did your VSES fuse come out with ease? I don't want to cause myself more headache. I'm in NY and we are expecting 30+inches of snow in the next 24hrs, rear heat would certainly be a blessing... SOS!!
Bryce Leonhardt I am not sure, I guess my best advice at this point is would be to pull the fuse again..... turn on truck for at least 30 seconds but not too much longer, turn switch off, replace fuse and try it. I am not sure if going longer than 40-50+ seconds will null the reset or not.
spitfire1821 I will attempt the 30sec increment hopefully that makes the difference. If not I will probably be investing in a new 60 amp fuse as a plan b. I did read on Amazon for some the fuse pulling didn't work and disconnecting the battery was necessary in order to reset any codes. I will keep everyone posted, perhaps my learning experience can help another poor soul as your contribution has.
I can’t seem to find this part anywhere, does that mean it is no longer in production? Is there any chance you can post a link in reply to the correct part??
Good demonstration. Only bit I would add. When replacing an electrical component inspect the failed component connections. Just in case of corrosion which you will want to clean if found. Dielectric grease is also a good idea especially for electrical connections on the cars exterior.
I have a 2006 Chev Suburban. The heat is going in and out in the front. It's like when i hit a small bump it goes out and then eventually will get hot again. Could this be a quick fix? The back heat doesn't work at all, so my husband hopefully can watch this video and replace that part. Thanks for your help!
Not sure I can help with the front heat issue other than checking fuses. Google search and reading a bunch of forums might be your best bet there. Good luck, hopefully you get it figured out. If you do please report back. Thanks!
Very good and to the point video. Expedited access to the rear unit. I have replaced all front actuators on the 2004 Yukon last year, now I have the rear blowing hot or warm when a/c is on blowing properly in the front. Seems the rear has too much heat and no a/c or cooling. I am hearing the clicking sound on r/rear now so do you think its this module or one of the actuators?
Did you replace the Module? I guess I didn't if you did or didn't. If you didn't It may be that, but if you are getting a clicking noise back there, it would make me think that the actuator is getting power and ether engaging or trying to engage. You might have to tear it down again and have someone watch as the switch is thrown to see if the lever is moving or trying to move. I wouldn't think that you would have an obstruction in there, but wouldn't hurt to check if it is moving and not going through it's full movement. It could be the actuator too. I'm not quite sure how to test these for function, but I'm sure someone should have some info on the internet someone about that. Sorry I do not have a definitive answer for you, but maybe some of my suggestions will head you in the right direction. Thanks for the watching and thanks for the comments.
Using the GM service bulletin as guide and not knowing which of the two codes I had, its a gamble. Apparently mine was the B0424 which was the heat/cold actuator. Regardless the problem is corrected with that.
I have been trying to find a video to show how to pull the interior trim.....This was perfect!! I am replacing the Woofer on the other side in an '01 THANK YOU!
+bfriendly100 Glad I was able to help. When I made this I was in the same boat as far as there was nothing showing how to tear it all apart. Thanks for watching and commenting!
Really helpful video. We have an 03 Z71 Tahoe that we bought new in December 2002 - still running, but I know that sooner or later I'll need this video. Thanks for the tips.
thanks, great video and tutorial. Unfortunately I changed out the module but got nothing. I have zero rear heat or a/c or even air blowing at all...it's as if it has no power at all. Yes, I have checked the aux/auto things. The front hvac works great. Any ideas what to check back there? checked the fuses, they seem fine. Oh, this is for an '05 Cadillac Escalade thanks!!
Excellent video... I'm having that very problem right now. No rear heat Yukon Denali XL. Also front blower controls not turning the blower on. Possible blower control resistor problem.
Can I trouble you with a question? I originaly had no rear heat in my 03 Tahoe, I replaced the control module as you suggested and WA LA! We had heat, so I thought I would check the rear AC and it blows warm air, the front AC blows cold. Should I be looking at the rear heater/AC blend door actuator or could it be something else? Thank you.
+Boe Jebie You could. I'm not 100% sure what the issue would be but there are a lot of comments below talking about similar issues. I can't recall if anyone posted a fix. Thanks!
Precision Machine Shed: I really appreciate your video on showing how to remove that panel. Because of your video I got to fix my Suburban rear A/C resistor. Thanks for tha awesome VID!!!!
Good stuff here. I have a 02 yukon and my friend has a 05 Denali. He asked me about this problem and I had no idea. Hopefully he can get right with this info. Thanks
I think a lot of people start swapping parts and start with the cheapest or most obvious one first and go from there. This module fixed my issue at the time, but that would have probably been my second part to replace.
this video is awesome, thanks for sharing, I got probably same issue on my 2005 Tahoe but, only hot air on the rear, changing the AC Control Module like showed will fix my problem??... thanks
+Adolfo Prieto Thanks, I'm not sure if would fix it or not, but it kind of makes sense that it would. I know several other people have asked the exact same questions below and I have not heard back from any of them if this works.
So I have kinda the same issue in my 03 tahoe.. rear controls dont work at all. Just blows COOL air.. wont get cold or hot heat.. would you recommend the same process?? Switching the rear module?!
Thanks for the video. The air in the rear of my 2005 Chevy Tahoe has been blowing hot and will not go cold. I removed the back panel and replaced the actuator with ACDelco 15-72972. After installing I waited a few minutes for the actuator to calibrate before turning the car off and then on again and then starting the air. The rear still blows only hot air - do you know what the problem could be?
+Brian Olson Not sure but you might have to pull the fuse again and go through the reprogramming again. There are quite a few guys that had to do it more than once before it took.
Hey, just thought I'd share my experience. This video was extremely helpful in changing the HVAC control module, however, the explanation on how to re-calibrate the actuators, would NOT help work for me! What I ended up doing, by searching other sites, was: set both front and rear climate control to cool, turn the ignition to off, pull the HVAC fuse, wait 10 seconds, reinstall fuse, turn vehicle on for 40 seconds while actuators calibrated, turn vehicle off, start vehicle, and the heat finally started working. So, if any of you all have issues getting the dang thing to re calibrate, try this out as well. Thanks, awesome video, extremely helpful, step-by-step instructions!!!
Josh Crosland Thanks for that tip. I'm didn't mention that or do I remember where my heat settings were. Maybe I got lucky.. Glad to hear you got yours working!
spitfire1821 does this help also if the A/C isn't coming out also? Just replaced a compressor. A/C is coming out the front of the truck nice and cold but still no A/C or heat coming out of the rear vents.
vincent rawlinson I'm not 100% sure, but this module does control a flap which switches from heated air to the duct for cold air. If you let it run for 10 plus mins and nothing, than I can't say for sure. You could try reading through the other comments here and see if you can come up with something.Sorry I couldn't be more help.
Great video, not sure if you said it, but this only applies to vehicles with automatic climate control. Ordered the module for my 04 Tahoe, only to find out it's not there. Ended up having a bad motor and picked up a reman at O'Reilly's
Thanks for your comments. I'm glad I could help you out. That's all I am is a DIY'er. I try and put out videos that make sense and are easy to follow. Be sure to check out my Channel if you haven't already. Thanks!
Hey guys I have hot heat in the rear at all times. I switch it to cool and it changes up front but still blows hot in the rear. I've tried changing the settings up front and in the rear. Could changing the module in the rear correct this issue? I welcome any ideas.
I am not sure, I have had several people ask the same question in the past couple months. I would be curious to know but it is possible that this could be the problem.
johnnylawrence did you figure it out? Mine is the same as you. Another video had the guy replacing theactuator to the right of the module this guy replaced. It controls the door that directs air over heater core and condenser...
Dustin Bingman what's up man no I haven't even tackled that project yet, worked on the cabin all summer! When I do and figure it out I will give an update
I have 04 GMC Yukon denali xl the same problem no heat in the rear here's a problem I can't take out the panel I pulled it very hard but it won't pop out can you help me out
HEY SPITFIRE 1821!!!!, thank you for a complete and easy to follow video. I was able to knock this replacement job out in less then 20 Minutes...Sweet Big Thanks....:)
I hear a noice in mine in the back of it like a clunking noice when I’m driving is it that? Definitely not drive train or suspension. It’s definitely in the inside in that area
Great video.. Question.. my Aspirator we bad..i changed that bc it was buzzing and my front heater wasn't blowing heat fast enough...fixed tht. But b4 unchanged it my rear beater was working perfect. Since unchanged the front sensor my back heater went out... do u know anything about this? I do hear a buzzing sound from the back when I turn my truck off..same same buzzing sound I had from the front sensor aspirator
Sorry for the typos..its cold in my truck and I just got off work.... was watching ur video. It's to dam cold here in New orleans..i need some heat..lol
Not sure if you've figured it out yet. It's -10 here today. First thing I would check would be the fuse for the rear heater. I show it in the video. Check and see if it's bad. Otherwise try the reset I show too. Other than that, you may have a bad part in the rear too.
Awesome video ... thank you for posting it! I suppose I should check the fuse first... But is there anything else I should check before I order this part?
maybe, going off memory, if it's stuck in the cool air position, it will actuate the door and flip it. Otherwise, i think possibly one of the switches on the dash may cause that too.
Thanks for the video. Do you know if the rear zone blower and especially the resistor for it is under that cover you removed? Two speeds on my wife's rear zone don't work anymore.
hckyplyr9285 Hey, I'm not completely sure. If you are getting heat,but only on a couple speeds could be the speed control switch. As for a resistor, I can't help you there. Thanks for watching!
I have a 2005 Tahoe and I'm having the same problem. No rear heat at all, no matter what the setting. My new module just came in this afternoon and I got it switched out, but still no heat at all in the rear. Even after idling the Tahoe for over 5 minutes and then taking it for a drive to town to get gas. Any other ideas on what the problem might be?
Did you follow the procedure for re-programming the new unit? I know when I did mine, I had to go back and re-do it once or twice before I got it right and it started working properly. I forgot, but I mentioned how I did it in the video. Other than that I'm not sure. That part controls the vent flaps that switch between hot and cold. I think there are two flaps on there, so I would go over the programming before trying something else. Maybe someone else has an idea that I am missing. Hope it works out, I know it's frustrating!
spitfire1821 I'm pretty sure I followed your steps to reprogram the new unit. When I installed it I had the fuse out so after I got it in I re-installed the fuse, turned the Tahoe on for a bit (I didn't time it but I think it was around 30 seconds) then I started the vehicle and let it idle with the heat on while I put all of the panels back on. Still no heat so I drove around for a bit to get it up to operating temperature faster but never got any heat at all out of the rear air. Then later last night when I was doing a little more research I read on a forum somewhere about disconnecting the battery and touching the cables together for 30 seconds to reset all of the modules back to their original positions. So I tried that this morning. I disconnected the cables, held them together for a little over 30 seconds, left them disconnected for about 20 minutes, then reconnected them and drove my daughter to school. After all of this I still have no heat in the rear. Any other ideas? Could it be something else?
Jason Roberts Ok, from what you said, you replaced the unit, put the fuse back in and went through the 30 second re-program thing and then tried starting. What you need to do is pull the fuse, turn the truck on for at least 30 second, without starting, then shut it off, then put the fuse back in, and then try starting and seeing if it will work. If you don't have the fuse pulled when you do the 30 sec reprogram, I don't think it will read properly and cause the new unit not to work. What you did is what I did the first time and it didn't work. Try that and let me know.
I'm not sure, you can read through the comments because there has been a lot of people with similar problems. This fix repairs the controller that moves the hot/cold air flap. It might help.
Thank You, I just got this vehicle didn't even know there was a heater core back there.i have a question right on top of the tailpipe there's a drain hose is that for the A.C or also for the coolant, because 3 days ago I filled the coolant reservoir and when I started my vehicle my service engine light was on and my RPM gauge worked only when I started moving & it said that I was low on coolant. Can you give me any idea on what it could be even just that slippery water coming out from the back drain. Thank You
+Michael Kiser Hmmm.... Mine has been working great since I originally posted this video. My first guess would be a fuse, but after that I'm not sure. I know a bunch of people have commented here about this repair and maybe there is something in the comments. Sorry I couldn't be more help. Thanks for watching.
Bad heater core. If the front blows hot air and the rear lines don’t get hot at all it’s a bad rear heater core. You could try to flush the core but at that point its probably best to flush and replace.
I'm a single mom of 4 kids so I've been doing all my repairs by watching You Tube videos. However, my 2005 Tahoe does not have this black box nor the red and gray plugs. I don't have any air flow in the rear, neither hot nor cold. In fact my rear blower will not work (even though I've replaced it) and I've changed out my rear resistor and still nothing. What could my problem be?
I'm no expert, but I'll try and ramble off a few things. Maybe you have tried these already. Fuse, speed switch (these crap out sometimes) could try resetting the computer. I mention how to do it towards the end of the video. It's been a while since I messed with this and the truck is long gone. sorry I couldn't be more help.
Thank you very much for your excellent video, I had to return one back to the dealer thinking it was the incorrect module that they had given me. But thanks to your video I was able to calibrate the module by following the steps you show on the video. Thank you very much again I owe you lunch my friend!!!!!
Hey there, my brothers 2000 Chevy suburban 1500 does not have any air conditioning in the rear. I put an ac belt under the hood and the front ac works but not the rear. No air comes out at all. Do you have any suggestions as to what I can do to help it?
Jose Rocha I can't say 100%, but this fix fixes the flap that switches back and forth from a/c to heat. There is a chance that it is stuck open on heat, but i'm not sure. I know there is a separate a/c blower in the back these. Sorry I couldn't give you a better answer!
Hi thank you for this video, I on the other hand gave a different isue my 2003 suburban after a long weekend trip up to Eustis FL my rear Ac unit stop working for some reason can't figure out why cause my front unit works no problem so maybe u think this could be the problem please wat saids thanku for these videos
+lolo ent No problem, as far as your issues I am not sure. I have not had that issue so I have not had to fix it. I know there were several people that have commented on this video that have asked about that issue. Maybe you could ask one of those people and maybe they figured it out. Sorry I couldn't be of more help to you!
will this work for a 2004 escalade it would only blow cold air in the back in the front everthing works but in the rear only cold. But I need warm air and it only blows cold. would this work
Hi , good video but I'm having a different problem with my suburban the rear fan keeps running after it's been turned of completely it end up detaining the battery I'm wondering if you can help thank you.
Just bought an 04 Tahoe 130K for 8K, and here I am ;) thanks for the heads up man!!! The rear heat has its own personality!! So I'm going to dive in head first, and this gives me a place to start! Thanks again!!! ;)
+Jalil Alhawari Hello, I am not sure, but it sounds like a bad switch to me. I've had similar problems with an older 1999 Grand Prix I had several years ago, and also a similar problem on my in-laws 95 Honda Accord!
Hello everyone, I have some heating/cooling issues with my newly purchased 03 Yukon Denali. In the front, I only get the defrost working. The only thing that I can control is the speed of blower but does not blow cold although I hear ac compressor kicks in and the ac line stays cold. In the rear, nothing happens. The lights on rear control module comes on for a second but shuts off by itself! Any suggestions appreciated.
+Michael Miller I believe so, I put it in the video towards the end. I can't recall exactly, but I know there are some comments on this video where it has been talked about in several posts too.
Thanks sooo much! Your video was awesome! I'm a single mother who doesn't have extra money and your video showed me exactly how to replace the control module, down to needing a 9/32 socket. I bought the part on ebay for $64 and it took me 20 minutes from start to finish. Thanks again!
+Colorado Girl
Glad to hear it worked out for you! Thanks for letting me know!
Colorado Giró
Colorado Girl, you rock!
What is the search name for the part on eBay?
Just made this repair, which I was dreading. It was much easier than I expected and worked perfectly afterwards.
Ordered my part from Amazon on Saturday, received it this morning. Just finished it took about twenty minutes works great. Now my granddaughter won't be cold this winter. Of course today it was 72 degrees. I have a 2004 Tahoe thanks.
Sounds good, glad it worked. At least now you're ready for when it does get cold!
Anybody know what the parts name is and what the part number is at amazon. I can’t find it anywhere. Amazon, EBay or net
What is the name of this part,also was the heat just not working at all in the rear?
*Easy to assemble **Fastly.Cool*
Spitfire, thank you for a complete and easy to follow video. It really gave me confidence to jump in and make this repair. I had my laptop out in the garage and would stop and refer to the video...and the problem is fixed. Again, great job and thank you!
No problem, thanks for watching. I have done that with my computer before too!
I just want to say thank you for posting this video, it's a great step by step procedure for replacing the rear aux heating module, it was a breeze, and the best part is that it fixed the problem, I now have rear heat. Thank you again!
+Boe Jebie
No problem, glad to hear it worked for you and thanks for letting me know!
I have the same issue in my Yukon but I'm wondering how you diagnosed it?
Thanks so much for the post. I have 2004 chevy tahoe and my issue was the front vents were blowing cold air but the back vents were blowing hot air. The part number you recommended fixed it right up, thanks again...
+RICKY GRAY
No problem, glad to hear it worked out for you.
Bro you know thats a lie.. the front has nothing to do with the back. The rear has its own motor and actuators that control that heat and ac
05 yukon. Gm suks electrical issues everywhere. All my heater controls have had problems including the heater digital control box i replaced with a junkyard box and it performs exactly the same way, Only heats the vehicle if I set it at 90°.
Now my rear heat does not work for the second year in a row in the middle of the bitter cold winter and I decided to chop a hole in the area where you showed the actuator is located and I'm going to turn the flap door to the heat position and put a screw to hold it. Forever. My AC doesn't work anyway.
I have a 2002 Chevy Tahoe
The blower in rear stop working. I followed your instructions. Instead of replacing it. I tap it and it works. I will replace it soon but as long I don't put the controller on high. Thank you.
Great to hear that worked.
It could also be a bad blend door actuator that will cause no heat in the rear as well
Thank you for this, my 05 yukon has this issue started last year, I love the rear heat as a neck warmer and not being able to use rear heat really sucks lol
The rear fuse is the RR HVAC. its actually the 30 amp fuse. At least on my Cadillac escalade. the 10 amp fuse runs the front. I was getting A/C in the back when I wanted Heat. The actuator (next to the module that's replaced in this video) was not switching from AC to heat. I replaced it, the actuator reset by switching back and forth but then now it stays on cold again. Going to replace the module next. Good video, some people might have to replace both to get it working.
That's good info, Thanks for taking the time to post it here!
Okay Google power windows
Have you had to replace actuator dooes or other in dash fixes for hvac in your Tahoe yet?
Bought the module and both actuators for $40 at my local junk yard.
Great video. I've been driving around for at least 3 years with no heat in the back of my truck. This winter the kids have been complaining more than normal, so I figured it was time to fix it. Swapped out the module, and at first, I still couldn't get any warm air in the back. I tried pulling the fuse several times, and nothing would work. After another Google search, I found a thread somewhere that mentions pulling the 60 amp VSES/ECAS fuse under the hood. That should be for the stability control, so I couldn't imagine it would work. IT DID!!! Now I have hot air, and the kids are happy. Thanks!
Glad to hear that you finally got it working. The reason I fixed mine was because we had a new born and couldn't drive around without heat! Thanks for watching, I appreciate it!
Spitfire thank you for the informative and $$ saving post, I followed your instructions to spec, after buttoning all the trim/panels back together I still am getting cold air! I have pulled the fuse turned the truck to ON for 1min interval shut truck off replaced fuse at least 5x with the truck at normal operating temperature. Blowing plenty hot in the cockpit but 2nd and 3rd row remain cold. I attempted to pull the VSES 60amp fuse that Mike refers to above. In my attempt it would not come loose and ended up crushing some of the plastic around the fuse with the pliers.
Mike did your VSES fuse come out with ease? I don't want to cause myself more headache. I'm in NY and we are expecting 30+inches of snow in the next 24hrs, rear heat would certainly be a blessing...
SOS!!
Yes, mine popped right out.
Bryce Leonhardt I am not sure, I guess my best advice at this point is would be to pull the fuse again..... turn on truck for at least 30 seconds but not too much longer, turn switch off, replace fuse and try it. I am not sure if going longer than 40-50+ seconds will null the reset or not.
spitfire1821 I will attempt the 30sec increment hopefully that makes the difference. If not I will probably be investing in a new 60 amp fuse as a plan b. I did read on Amazon for some the fuse pulling didn't work and disconnecting the battery was necessary in order to reset any codes. I will keep everyone posted, perhaps my learning experience can help another poor soul as your contribution has.
Excellent video!!! Upon completion it took a little time for my suburban to warm up (40 degrees F outside) but the warm air is working again.
glad to hear it worked out.
I can’t seem to find this part anywhere, does that mean it is no longer in production? Is there any chance you can post a link in reply to the correct part??
I can't find it ether. You may need to do some searching.
Does this module control the fan or the radiator fluid, or both? I have fan but no heat.
My yukon has that. Mine won’t blow at all. Course I’ve not checked the fuse either. Thanks!!
It could be your Blower motor resistor.
I have the same problem but I own a 2003 GMC Yukon. Would this be the same part number as yours?
Good demonstration. Only bit I would add. When replacing an electrical component inspect the failed component connections. Just in case of corrosion which you will want to clean if found. Dielectric grease is also a good idea especially for electrical connections on the cars exterior.
I agree.
I have a 2006 Chev Suburban. The heat is going in and out in the front. It's like when i hit a small bump it goes out and then eventually will get hot again. Could this be a quick fix? The back heat doesn't work at all, so my husband hopefully can watch this video and replace that part. Thanks for your help!
Not sure I can help with the front heat issue other than checking fuses. Google search and reading a bunch of forums might be your best bet there. Good luck, hopefully you get it figured out. If you do please report back. Thanks!
Crystal Thomas could be thermostat or low coolant
It was the coolant!!! Yay!!!
Very good and to the point video. Expedited access to the rear unit. I have replaced all front actuators on the 2004 Yukon last year, now I have the rear blowing hot or warm when a/c is on blowing properly in the front. Seems the rear has too much heat and no a/c or cooling. I am hearing the clicking sound on r/rear now so do you think its this module or one of the actuators?
Did you replace the Module? I guess I didn't if you did or didn't. If you didn't It may be that, but if you are getting a clicking noise back there, it would make me think that the actuator is getting power and ether engaging or trying to engage. You might have to tear it down again and have someone watch as the switch is thrown to see if the lever is moving or trying to move. I wouldn't think that you would have an obstruction in there, but wouldn't hurt to check if it is moving and not going through it's full movement. It could be the actuator too. I'm not quite sure how to test these for function, but I'm sure someone should have some info on the internet someone about that. Sorry I do not have a definitive answer for you, but maybe some of my suggestions will head you in the right direction. Thanks for the watching and thanks for the comments.
Using the GM service bulletin as guide and not knowing which of the two codes I had, its a gamble. Apparently mine was the B0424 which was the heat/cold actuator. Regardless the problem is corrected with that.
That's good to know, Thanks for letting us know!
I have been trying to find a video to show how to pull the interior trim.....This was perfect!! I am replacing the Woofer on the other side in an '01 THANK YOU!
+bfriendly100
Glad I was able to help. When I made this I was in the same boat as far as there was nothing showing how to tear it all apart. Thanks for watching and commenting!
Really helpful video. We have an 03 Z71 Tahoe that we bought new in December 2002 - still running, but I know that sooner or later I'll need this video. Thanks for the tips.
thanks, great video and tutorial. Unfortunately I changed out the module but got nothing. I have zero rear heat or a/c or even air blowing at all...it's as if it has no power at all. Yes, I have checked the aux/auto things. The front hvac works great. Any ideas what to check back there? checked the fuses, they seem fine. Oh, this is for an '05 Cadillac Escalade thanks!!
Have you fixed your problem because i have the same problem.
i would say check your blower. if you have no air blowing at all then the blower would be the prolem 9/10 times
Check your rear blower motor resistor/controller. If that goes you will have no heat or a.c. at ANY speeds.
Excellent video... I'm having that very problem right now. No rear heat Yukon Denali XL. Also front blower controls not turning the blower on. Possible blower control resistor problem.
Maybe, You might have a bad switch too. My front end has always worked great. My rear heat is still working great two years after this fix also.
What is that part called that you replaced
Thanks 👍
This is to fix the heater on the headliner right?
I'm really thankful for your video. I was having the same problem with no rear heat. I changed the module myself after watching ur video 👍
Glad it helped
Can I trouble you with a question? I originaly had no rear heat in my 03 Tahoe, I replaced the control module as you suggested and WA LA! We had heat, so I thought I would check the rear AC and it blows warm air, the front AC blows cold. Should I be looking at the rear heater/AC blend door actuator or could it be something else? Thank you.
+Boe Jebie
You could. I'm not 100% sure what the issue would be but there are a lot of comments below talking about similar issues. I can't recall if anyone posted a fix. Thanks!
Good video, it's the same process in my 03 Yukon.
My Tahoe is getting no ac in the back,is it the same or could it be the blend door actuator in the back?
How do you fix your cold ac.i have only heat coming out and my rear controls where the rear passengers can control went out just went dead
Precision Machine Shed: I really appreciate your video on showing how to remove that panel. Because of your video I got to fix my Suburban rear A/C resistor. Thanks for tha awesome VID!!!!
Glad it helped you out.
What is the part number of the actuator the decides if it blow cold or heat?
I replaced that part I didn't know about taking the fuse out. I will do that and see of it starts working
mine doesnt have heat or cold but the blower runs perfect. Is that same part the problem?
My rear AC doesn't blow at all... Would you suggest the same fix?
Could be a fuse, this just fixes the controller that actuates the door going from hot to cold air.
outstanding video, took me about 30 mins from start to finish and I have heat again. Thanks for taking the time to upload!
+Vital Imagery
No problem, thanks for letting me know it worked out for you! Thanks!
Good stuff here. I have a 02 yukon and my friend has a 05 Denali. He asked me about this problem and I had no idea. Hopefully he can get right with this info. Thanks
I have a 2007 Yukon STL and was wondering if it's the same fix
That's the newer style of course, but the parts are probably similar.
Do the 1993 suburban have that behind there too?? I have no cold air blowing from the rear
I am not sure myself.
How did you get the black knobs screwed back on when you put put back on??
It's been so long since I did this I cannot remember.
I had a rear blend door actuator go bad not sure how you diagnosed it?
I think a lot of people start swapping parts and start with the cheapest or most obvious one first and go from there. This module fixed my issue at the time, but that would have probably been my second part to replace.
this video is awesome, thanks for sharing, I got probably same issue on my 2005 Tahoe but, only hot air on the rear, changing the AC Control Module like showed will fix my problem??... thanks
+Adolfo Prieto
Thanks, I'm not sure if would fix it or not, but it kind of makes sense that it would. I know several other people have asked the exact same questions below and I have not heard back from any of them if this works.
Nice job. Exactly what I was looking for. Now I will replace the same module in my 2006 Tahoe.
Thanks you was a big help now I'm officially a TH-cam mechanic 😂
So I have kinda the same issue in my 03 tahoe.. rear controls dont work at all. Just blows COOL air.. wont get cold or hot heat.. would you recommend the same process?? Switching the rear module?!
Thanks for the video. The air in the rear of my 2005 Chevy Tahoe has been blowing hot and will not go cold. I removed the back panel and replaced the actuator with ACDelco 15-72972. After installing I waited a few minutes for the actuator to calibrate before turning the car off and then on again and then starting the air. The rear still blows only hot air - do you know what the problem could be?
+Brian Olson
Not sure but you might have to pull the fuse again and go through the reprogramming again. There are quite a few guys that had to do it more than once before it took.
+spitfire1821
Thanks for the quick reply. Can you please remind me how to reprogram?
I can't remember, I explain it in the video.
Hey, just thought I'd share my experience. This video was extremely helpful in changing the HVAC control module, however, the explanation on how to re-calibrate the actuators, would NOT help work for me! What I ended up doing, by searching other sites, was: set both front and rear climate control to cool, turn the ignition to off, pull the HVAC fuse, wait 10 seconds, reinstall fuse, turn vehicle on for 40 seconds while actuators calibrated, turn vehicle off, start vehicle, and the heat finally started working.
So, if any of you all have issues getting the dang thing to re calibrate, try this out as well.
Thanks, awesome video, extremely helpful, step-by-step instructions!!!
Josh Crosland Thanks for that tip. I'm didn't mention that or do I remember where my heat settings were. Maybe I got lucky.. Glad to hear you got yours working!
spitfire1821 does this help also if the A/C isn't coming out also? Just replaced a compressor. A/C is coming out the front of the truck nice and cold but still no A/C or heat coming out of the rear vents.
vincent rawlinson
I'm not 100% sure, but this module does control a flap which switches from heated air to the duct for cold air. If you let it run for 10 plus mins and nothing, than I can't say for sure. You could try reading through the other comments here and see if you can come up with something.Sorry I couldn't be more help.
Great video, not sure if you said it, but this only applies to vehicles with automatic climate control. Ordered the module for my 04 Tahoe, only to find out it's not there. Ended up having a bad motor and picked up a reman at O'Reilly's
Good to know. Never thought about the auto climate control myself.
How much was the module of dollar-wise?
I have a 99 gmc suburban where would the module be in those I cant seem to find anything about my year for the rear heat/ac
Thanks for the video! REALLY helped me save some cash by doing the repair on my own. Tubers like you really help the everyday DIY'er. Thanks again!
Thanks for your comments. I'm glad I could help you out. That's all I am is a DIY'er. I try and put out videos that make sense and are easy to follow. Be sure to check out my Channel if you haven't already. Thanks!
Hey guys I have hot heat in the rear at all times. I switch it to cool and it changes up front but still blows hot in the rear. I've tried changing the settings up front and in the rear. Could changing the module in the rear correct this issue? I welcome any ideas.
same here. did you ever fix it?
No it just started working again on its own.
my tahoe2004 is not blowing cold air in rear seats and i was wondering if i changed that will it help fix this problem
You can read through the comments. This repair fixed the control mechanism for the actuator that flips the door from hot to cold.
Is there a way to be sure this is the part needed to fix the problems before buying it?
Basically I based the repair on the symptoms of the truck.
Have 03 yukon Denali and I have the opposite issue. No AC in the back. Will this part serve the same purpose?
I am not sure, I have had several people ask the same question in the past couple months. I would be curious to know but it is possible that this could be the problem.
johnnylawrence did you figure it out? Mine is the same as you. Another video had the guy replacing theactuator to the right of the module this guy replaced. It controls the door that directs air over heater core and condenser...
Dustin Bingman what's up man no I haven't even tackled that project yet, worked on the cabin all summer! When I do and figure it out I will give an update
I have 04 GMC Yukon denali xl the same problem no heat in the rear here's a problem I can't take out the panel I pulled it very hard but it won't pop out can you help me out
HEY SPITFIRE 1821!!!!, thank you for a complete and easy to follow video. I was able to knock this replacement job out in less then 20 Minutes...Sweet Big Thanks....:)
No problem, Glad it helpful!
Hey Sitefire. Heads up now i don't have AC blowing in the back.im working it now but no idea as of yet...any idea what might be my issue? Thanks
I hear a noice in mine in the back of it like a clunking noice when I’m driving is it that? Definitely not drive train or suspension. It’s definitely in the inside in that area
I have a 05 Chevy Tahoe and I hear that same noise I wonder is that the problem
@@davonteammons1684 it sounds like its the blend door that has broke and is rattling around in yours.
This guy really knows how to get shit popin off! 😂
Do what it takes.
thank you mine keeps blowing hot won.t go to cold this might be what wrong with it
What's the purpose of turning on the vehicle for 30 seconds before installing fuse?
My truck will blow ac & heat out in the front but not in the back is it the same to fix it ?
Should be
Great video.. Question.. my Aspirator we bad..i changed that bc it was buzzing and my front heater wasn't blowing heat fast enough...fixed tht. But b4 unchanged it my rear beater was working perfect. Since unchanged the front sensor my back heater went out... do u know anything about this? I do hear a buzzing sound from the back when I turn my truck off..same same buzzing sound I had from the front sensor aspirator
Sorry for the typos..its cold in my truck and I just got off work.... was watching ur video. It's to dam cold here in New orleans..i need some heat..lol
Not sure if you've figured it out yet. It's -10 here today. First thing I would check would be the fuse for the rear heater. I show it in the video. Check and see if it's bad. Otherwise try the reset I show too. Other than that, you may have a bad part in the rear too.
How much did that cost the rear heater box
Awesome video ... thank you for posting it! I suppose I should check the fuse first... But is there anything else I should check before I order this part?
Not that I can think of.
What if you have rear heat only would this fix that as well?
maybe, going off memory, if it's stuck in the cool air position, it will actuate the door and flip it. Otherwise, i think possibly one of the switches on the dash may cause that too.
Thanks for the video. Do you know if the rear zone blower and especially the resistor for it is under that cover you removed? Two speeds on my wife's rear zone don't work anymore.
hckyplyr9285 Hey, I'm not completely sure. If you are getting heat,but only on a couple speeds could be the speed control switch. As for a resistor, I can't help you there. Thanks for watching!
I have a 2005 Tahoe and I'm having the same problem. No rear heat at all, no matter what the setting. My new module just came in this afternoon and I got it switched out, but still no heat at all in the rear. Even after idling the Tahoe for over 5 minutes and then taking it for a drive to town to get gas. Any other ideas on what the problem might be?
Did you follow the procedure for re-programming the new unit? I know when I did mine, I had to go back and re-do it once or twice before I got it right and it started working properly. I forgot, but I mentioned how I did it in the video. Other than that I'm not sure. That part controls the vent flaps that switch between hot and cold. I think there are two flaps on there, so I would go over the programming before trying something else.
Maybe someone else has an idea that I am missing. Hope it works out, I know it's frustrating!
spitfire1821 I'm pretty sure I followed your steps to reprogram the new unit. When I installed it I had the fuse out so after I got it in I re-installed the fuse, turned the Tahoe on for a bit (I didn't time it but I think it was around 30 seconds) then I started the vehicle and let it idle with the heat on while I put all of the panels back on. Still no heat so I drove around for a bit to get it up to operating temperature faster but never got any heat at all out of the rear air.
Then later last night when I was doing a little more research I read on a forum somewhere about disconnecting the battery and touching the cables together for 30 seconds to reset all of the modules back to their original positions. So I tried that this morning. I disconnected the cables, held them together for a little over 30 seconds, left them disconnected for about 20 minutes, then reconnected them and drove my daughter to school. After all of this I still have no heat in the rear.
Any other ideas? Could it be something else?
Jason Roberts
Ok, from what you said, you replaced the unit, put the fuse back in and went through the 30 second re-program thing and then tried starting.
What you need to do is pull the fuse, turn the truck on for at least 30 second, without starting, then shut it off, then put the fuse back in, and then try starting and seeing if it will work.
If you don't have the fuse pulled when you do the 30 sec reprogram, I don't think it will read properly and cause the new unit not to work.
What you did is what I did the first time and it didn't work. Try that and let me know.
That did it. Tons of heat now. Thanks a ton.
Jason Roberts Glad to hear it worked out! It's like hitting the lottery....... well almost.
I'm having the exact opposite problem, no cool air. cold is going back through the pipes, is the part you replaced only for the heat?
I'm not sure, you can read through the comments because there has been a lot of people with similar problems. This fix repairs the controller that moves the hot/cold air flap. It might help.
Thank You, I just got this vehicle didn't even know there was a heater core back there.i have a question right on top of the tailpipe
there's a drain hose is that for the A.C or also for the coolant, because 3 days ago I filled the coolant reservoir and when I started my vehicle my service engine light was on and my RPM gauge worked only when I started moving & it said that I was low on coolant. Can you give me any idea on what it could be even just that slippery water coming out from the back drain. Thank You
Sounds like your back heater core is leaking. I'm no mechanic though.
This worked for about a week and now it's blowing cold air again. Did you have any issues after installation?
+Michael Kiser
Hmmm.... Mine has been working great since I originally posted this video. My first guess would be a fuse, but after that I'm not sure. I know a bunch of people have commented here about this repair and maybe there is something in the comments. Sorry I couldn't be more help. Thanks for watching.
I took the fuse out and recalibrated the HVAC a 2nd time and now it is working again, hopefully it will take this time. Thanks again
+Michael Kiser
Thanks for posting back. Hopefully it sticks!
My rear hoses aren't getting hot from antifreeze to provide heat?
Bad heater core. If the front blows hot air and the rear lines don’t get hot at all it’s a bad rear heater core. You could try to flush the core but at that point its probably best to flush and replace.
I'm a single mom of 4 kids so I've been doing all my repairs by watching You Tube videos. However, my 2005 Tahoe does not have this black box nor the red and gray plugs. I don't have any air flow in the rear, neither hot nor cold. In fact my rear blower will not work (even though I've replaced it) and I've changed out my rear resistor and still nothing. What could my problem be?
I'm no expert, but I'll try and ramble off a few things. Maybe you have tried these already. Fuse, speed switch (these crap out sometimes) could try resetting the computer. I mention how to do it towards the end of the video. It's been a while since I messed with this and the truck is long gone. sorry I couldn't be more help.
Thank you very much for your excellent video, I had to return one back to the dealer thinking it was the incorrect module that they had given me. But thanks to your video I was able to calibrate the module by following the steps you show on the video. Thank you very much again I owe you lunch my friend!!!!!
Great to hear!
This fixed my problem, Thank you!
Hi everyone, i got a problem with my rear A/C it blow air but it is hot instead of cold air, does anybody have a Clue?
Definitely about to try this now
Thanks so much for your video! Fixed the rear heat in my 2003 Yukon!
Joseph Horne Glad I was able to help you out and thanks for watching. I appreciate it!
Hey there, my brothers 2000 Chevy suburban 1500 does not have any air conditioning in the rear. I put an ac belt under the hood and the front ac works but not the rear. No air comes out at all. Do you have any suggestions as to what I can do to help it?
Jose Rocha I can't say 100%, but this fix fixes the flap that switches back and forth from a/c to heat. There is a chance that it is stuck open on heat, but i'm not sure. I know there is a separate a/c blower in the back these. Sorry I couldn't give you a better answer!
Thank you for taking the time to respond. I appreciate your comments.
No problem!
Sorry what is the part name thanks
Hi thank you for this video, I on the other hand gave a different isue my 2003 suburban after a long weekend trip up to Eustis FL my rear Ac unit stop working for some reason can't figure out why cause my front unit works no problem so maybe u think this could be the problem please wat saids thanku for these videos
+lolo ent
No problem, as far as your issues I am not sure. I have not had that issue so I have not had to fix it. I know there were several people that have commented on this video that have asked about that issue. Maybe you could ask one of those people and maybe they figured it out. Sorry I couldn't be of more help to you!
will this work for a 2004 escalade it would only blow cold air in the back in the front everthing works but in the rear only cold. But I need warm air and it only blows cold. would this work
Should be very similar if not the same.
This was the perfect fix for my 2006 Chevy Suburban. The directions were exact and easy to follow. Thanks so much for this video!
No problem, glad it helped you out.
Hi , good video but I'm having a different problem with my suburban the rear fan keeps running after it's been turned of completely it end up detaining the battery I'm wondering if you can help thank you.
Sounds like possibly a switch problem.
Thanks spitfire1821, this made the repair to my 2003 Tahoe quick and easy.
Glad it was a help for you! Thanks for watching!
Just bought an 04 Tahoe 130K for 8K, and here I am ;) thanks for the heads up man!!! The rear heat has its own personality!! So I'm going to dive in head first, and this gives me a place to start! Thanks again!!! ;)
BUILTLIGHTWOUNDTIGHT man 8k for a 04? Is it at least a z71?
thanks this is a great video I appreciate your help we gotta learn to help one another thank you so much for the help
+Scotty tomcat
No problem, I appreciate the comments and thanks for watching.
Does anyone know if this fix carries over to the 06 trailblazers also? Have the same problem with no rear heat.
Will this work for my 01 yukon?
I have Trailblazer 2005 EXT, the rear blower doesn't work or some time work on 3rd speed only but on and off.
Any advice please.
+Jalil Alhawari Hello, I am not sure, but it sounds like a bad switch to me. I've had similar problems with an older 1999 Grand Prix I had several years ago, and also a similar problem on my in-laws 95 Honda Accord!
Hello everyone, I have some heating/cooling issues with my newly purchased 03 Yukon Denali. In the front, I only get the defrost working. The only thing that I can control is the speed of blower but does not blow cold although I hear ac compressor kicks in and the ac line stays cold. In the rear, nothing happens. The lights on rear control module comes on for a second but shuts off by itself! Any suggestions appreciated.
Good video, wasn't sure about how to get panel off. Thanks for the video
+Michael Kiser
No problem! Thanks for watching and glad I was able to help!
After installation, why do you turn it on and then insert fuse? Does that reset the system?
+Michael Miller
I believe so, I put it in the video towards the end. I can't recall exactly, but I know there are some comments on this video where it has been talked about in several posts too.
+spitfire1821 what if you didn't take the fuse out until you changed the part?
You should still be able to go through the reset and make it work.
+spitfire1821 ok. I noticed blend door actuators behind that panel. could they be bad?
+spitfire1821 The reason i ask is because I'm hardly getting any air from the vents from that side.
was it making a thumping sound before you replaced it?
No it was not.