GM Blower Motor Resistor Troubleshooting | 2002-2009 Chevy Trailblazer GMC Envoy or similar
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Blower Motor Resistor Troubleshooting | 2002-2009 Chevy Trailblazer GMC Envoy or similar
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This helped out so much I'm doing a drive across Canada and I'm 4000km away from home and about 200km from a mechanic who can speak English and it's currently 7pm so everything is closed, (I'm also car camping so this honestly saved my life/ sanity) thank you for this ❤
Good Luck
Hey boss just wanted you to know. That this is the first video on this subject and problem that offered an every man look at the situation .you saved me money and time and made a subscriber out of me. I wish you the best of luck with your channel and look forward to the next video thank you
Glad we could help. Thanks for watching.
Thank you for taking the time to share your experience. Your video was very helpful.
Glad it was helpful! Thanks for watching.
Just bought an 04 Envoy a couple days ago and the heat sometimes works and sometimes not. You just helped me to trouble shoot it and narrow it down.
Thank you
Glad to help
My 04 has the same exact issue this helped me a lot. Thank you saved a lot of time and stress
Glad to help
Thanks for this help, I look forward to more of your posts...GMC ENVOY XUV owner since 04
Welcome aboard!
This just happened with my 2007 trailblazer. A/C stopped blowing. I messed with the harness and sure enough, the fan came back on. Zip tied it, good to go. However, I see and smell burnt plastic on one of the wires, so I'll replace the harness just to be on the safe side. Thank you so much for making this video!
Glad to help
Thank you, I had to bang on my Resistor and heat , ac came on. Thanks for this wonderful video.
Thanks for watching.
By the glove compartment. I tried. Didn't work. Dang it.
Thank you so much. This happened to my blazer and you saved me a ton of money and time.
Glad I could help
Just bought the wife an '06 Trailblazer. The blower works on 1-4, but not on 5. I'll get up under there and see if a zip tie will fix it! Thanks so much for posting this! I've been wrenching on cars for 41 years now (since I was 16) and cheap fixes are still OK by me! Also, it would appear that your wife's Trailblazer is missing the plastic kick panel under the glove box, unless you removed it and didn't show that part.
Thanks for Watching.
You are the Man! Thanks so much for the advice, this fixed it for my wife and now she is Happy 😁
Glad to help.... Happy wife=happy life
Thank you so much!! You should be proud you have helped so many people!! I got this 2004 GMC Envoy "cash car" And I am having to fix issues myself. so your video helped me save some $ , I was about buy new everything!! i live in TX-- we gotta have AC in our cars. Any way,,, Thanks & be Blessed
Glad I could help! Thanks for watching.
Saved me money.. exactly the problem I had, it's to cold not to have heat. Thank you
Glad we could help. Thanks for watching.
You may never see this, but THANK YOU. I live in Fort Worth, Texas….OMG the summers are HOT. I can’t live with no A/C. I love Zip ties…hahaha. I was tickled. My husband died from cancer a few years ago and so I’m Ms Fixit on his Chevy Silverado. It’s getting old but I don’t care. I love that truck because he loved that truck. And yes I do do the mechanical work whenever I can. My past jobs working at a defense contractors in their mechanical & electrical assembly positions gave me a good start for auto mechanic work. And people like you give me the ability to get it done without needing a mechanic I can no longer afford. Thank you again. I’m pretty sure I have a similar problem because if I tap on it, it blows and I replaced the blower motor last year. So if it’s not a loose pin connector, then I’m just gonna go ahead and buy that connector 10:33 assembly and replace it which is right up my alley too, because I did a lot of wiring harnesses at the aforementioned job. 👍👍
Fingers crossed!
My hearter was working last night this morning it was out, im going to try everything you just did thanks.
Good luck
My plug wouldn’t stay tight to the resistor, so I cut up a plastic zip tie and jammed 4 pieces in it, now it all works 100% I am amazed. Thank you very much.
Gotta love Zip Tie Engineering. Thanks for watching.
My problem was identical on a 2007 GMC Sierra. Once I cleaned out the harness end and plugged it back into the resistor everything returned to normal. The 2007 GMCs do not have a cover over the resistor connections so they get touched by passenger's feet etc
Bingo! Loose harness great video and great help. Saved me a bunch of $$$
Glad it helped
Thank you so much for this video! I'm having the same issue and I didn't know how to troubleshoot this issue.
Glad it helped
awesome Rob thanks I will have check that out on my 02 Silverado 4x4 pick up
Glad to help
Awesome video. Mine has a loose wire as well...yeah!!!
Thank you
Great FFFING video. I am ready to light mine on fire. Well I was until I saw you.
UPDATE: I jiggled the harness to the module. It works. Same as you. I have no idea if it is the harness or the module. All I know is that I have a blowing fan now and I have heat. I miss the old days of a cable and a damper a nothing ever screwed up. It was simple and sweet. As it is now all those damn vacuum dampers on my ENVOY SLT are not opening up all the way. That is another can of worms I will have to deal with.
Thank you Thank you. You saved me a shit load of time and money!
Glad we could help. Thanks for Watching.
Suggestion: read over your comment before sending; you might take out a word or two, make it not so crude.
@@jimmy5F When did you discover you had a vagina Jimmy?!!!!!!!!
This video definitely helped me. My truck did the same thing. Crappy design
Glad it helped
Saved me hundreds! Thanks!
Glad it helped!
Nice find my brother.... HAPPY NEW YEAR!....I just subscribed... great channel great find on that pigtail harness...
Thanks for the sub
I haven't got a chance to try it yet but thank you for that information when I get back home to Texas by Future sister-in-law has 06 and she has the same problem sometimes it works on 5 and sometimes it doesn't.I will definitely check it out when I get home. Thanks
Glad to Help
I have a 04 GMC Envoy XL. The blower ( in the front ) works SOMETIMES 1-5 but past couple days it DONT WANT TO WORK. Now you wake up get in the car in the morning and it’s not working. Drive down the road and it just comes on or hit a speed bump and it comes on . It’s random. But your video cleared it up for me. I’ll bet it’s a loose harness. NOW I need to figure out WHY my independent rear system has AC but NO heat for the kids in the rear 2nd 3rd row seating. 🙄🙄 but your video has been a tremendous help . Thanks 😊
Hope it worked out for you. Thanks for watching.
Thank you, Very good video.
Glad you liked it!
Thanks for this video.
Glad to help
"Let me put the camera down and pull this out"
Which is the one thing I needed. I appreciate you guys trying to help; but skipping information doesn't seem to accomplish this. This is the seventh video I've looked at trying to figure out how to release the damn connector from the blower and not a single person shows what the magic trick is. It's either edited out or the camera shakes so it can't be seen.
Just take a good look at the connector. The separation point and disconnect tab should be fairly clear.
Simply ❤ how you emptied the glovebox. "...there we go..." 😂😂😂
😅
Great video. Thank you sir.
Also, thought you might want to know (just in case someone didn’t mention it already), someone has definitely been in that area before - the blower motor is missing the plastic cover that goes over the back of the motor (i assume the cover keeps the cables away from the motor so they don’t melt).
My AC is not working, but I didn’t check the harness or change the resistor, so I will be trying this tomorrow (or tonight if I get itchy). Thank you for the video sir.
Thanks for the info!
Ty, exactly what I needed to see.
Glad to help
Excellent infomation
Glad it was helpful!
Sweet! Thanks homie!
You're welcome. Thanks for watching.
@@AxlesGarage hey, so I finally replaced it. But the Damn fan 5 setting still won't work.
You might have to replace the actual part, or just go without #5
@@AxlesGarage I replaced exactly what you did. I'm in Florida, so 5 would be nice, but ive survived this long without it so no biggie. Thanks again man, I'll be sure to hit you up if I have more questions.
Good show, gave me some direction
Glad to help
Thanks this really helped me
Glad it helped
Thanks buddy same car same colour even as well lol and yup same exact problem and fix💪 😁
Much appreciated
No problem 👍
Awesome! I'm going to try this in my 04 Rainier before actually buying anything lol
Any luck??
@@AxlesGarage Well... im not sure if it was the tips from this video or not. But my heat and AC just started working every time *Knock on wood* lol. So I can't say doing this works or not. Sorry.
Just an FYI I tried various solutions to fix this problem this is what worked for me. No air , some air , blowing here and not where it should be to keep it short. With the vehicle off (a 2002 Chevy trailblazer LT) I pulled all the hvac fuses under the hood and under passenger seat in rear behind driver. I then started the vehicle for about 2 minutes then I turned it off reinstalled fuses started it and no issues since.
Wow, good info, thank you.
OMG I am sooo proud of myself and sooooo very thankful to you for posting this video and sharing your knowledge and expertise on this stuff! After watching this about 4 times now I finally managed to go back out and try one more time to get my blower to work again. It is that harness thing that’s real sketchy. I have had the blower stop and start repeatedly for 6 months or so but 2 weeks ago it stopped and I have been able to mash bang or jerk it to get it back in again. I’m 63 1/2 years old and a little bit overweight so trying to get down under my glovebox is a huge challenge plus I have pretty intense claustrophobia and panic and anxiety has hit every time I’ve tried to get down under there and start to roll over to my back. Anyway, I went out and used a mirror up under there to see What was happening and it’s definitely that harness thing cuz I yanked it a couple of times and it started to kick on. Yanked it a few more times and it came on and I placed a long thick stick down there to press it I to place until I can use a zip tie tomorrow to hold it on. What a crappy design eh? But lots of things on this 2003 Buick Rendezvous have been designed crappy. My parents bought it new off the showroom floor but then the dealer went out of business and a couple of recalls were missed and I’ve never been able to get Buick or GMC to acknowledge them so I’ve footed the repair bills myself or just deal with it. But sure glad such an easy to understand and follow video like this was available to help me get to this point to get it back on!! I am woman hear me roar! Heheh No, I could t have roared without your help so thanks!!
Thanks for the comments
My heater was working but there was a bad knocking in the dash so I replaced both actuators on passenger side ididnt unplug the power to the heat blower and got a ground and blew fuse. Tha caused the blower motor to run key off key on it blew the resistor so always unplug the battery. Now it works great thank you guys.jerryc
Glad to help
@@AxlesGarage Thank you Axles Garage for pointing me in the rite dirrction to fixing my car without watching your video on how to find and fix the problem with a heater blower and resistor on my 2009chevy impala by following your tips and doing exactly what you said to I repaired the resister module and didnt.hsve to go through every part associated with the blower to.fix it now it worksheets thanks to Axles garage. Also remember folks if its it's worth fixing fix it rite
Jerry combs ty
Thanks for watching
Thank you sooo much for this video. Mine had the same problem you sir saved my ass!
Glad we could help. Thanks for watching.
Thanks helped me out
Glad I could help
All of mine went out now. Ugh, it's in the high 90s here in Houston. I gotta fix this. I wiggled it for weeks and it worked, but not at the plug just at the wires. Speed five has never worked, speed four only sometimes did. I really don't need speed five as the A/C blows ridiculously cold. I hope if fixes cheap and easy like yours!
Good luck and thanks for watching.
Axle's Garage
Thanks. The harness was toast, just like the resistor. The harness actually was all black and one prong was broken off. Had to replace both. Took about two hours because the supplied wire connectors suck! I gave up and bought ones that were easy to use.
thanks for the hint on the loose harness.. got it working again 0 dollars!
This video is awesome! I bought a 2008 Trailblazer. Everytime I turn it off, the next time I get into started I would have no heat blowing. Replaced blower motor and resistor. But it is something in the fuses if I pull the fuse out under the hood but it back in, it blows Heat. I have been saying I think it's something under the dash there you have just about confirm that for me thank you
Right on!
I'm going to look into this on my 06 tbss when it warms up a bit. i can live without heat for my commute but i won't work on this thing outside when its -35 below.
Mine just went out today and it's in the negatives where I live also. I have to get it done asap hopefully it's an easy fix.
Hi Axle...how do you unplug the connector from the blower? I tried to pull the orange tab out and pull the connector out, it wouldn't come out. Just not sure I am doing the right thing. Thank you for the video.
Having the same problem, did you ever figure it out?
I'm actually having this problem right now gonna try it hopefully I dnt need to buy one
Good Luck
What is the name of the wiring harness I have a 2003 trailblazer and mines is kinda burned
What if my blower motor stays on you think it could be that or the resister?
All her shit is going to fall out of it. Let me move her stuff. There we go! Lmfao😂😂😂
LOL. Thanks for watching.
My 05 trailblazer had the same problem just put a cable tie in myself
Glad we could help. Thanks for watching.
do you happen to know how to fix the rear blower in the center console on a standard trailblazer not the ext large model?
No familiar with that, sorry.
Hey Rob I've got a 02 Tblazer I bought last year. When i bought it the heat worked but after time when I'd try to turn in on the engine would die. Now that it's cold again I'm finding it doesn't power on at all but the engine stays idling. Any ideas? I'm still going to follow your video here on my next day off n see if I can find the issue. Thanks for reading Rob!
If the blower fan kills the engine, you must have a short or a bad relay. Thats gonna be hard to diagnose. I wouldn't even know where to start. If it were me, I would consult with my local mechanic for ideas
@@AxlesGarage thanks axle
My pleasure
Should you have power to the fan switch on the dash or does the power to that switch come from the resistor??
I'm not sure. The Trailblazer is long gone. Never really liked it at all.
Thanks man....I think it comes from the resistor and the problem I believe stems from a blown blower motor. Appreiate the come back tho, stay safe!!!
Axle! I need help. Having the same problem with my 05 envoy and Cant figure out where my mode actuator is located
Sorry, I am not sure, and we sold that car a while back. Thanks for watching.
Maybe I missed it at the beginning,Does this apply to both manual and auto controls? Thanks.
Yes it does
How did you get the harness out mine is stuck in the resistor I’m pulling and it don’t wanna come out
If your is stuck, it might be melted. Gonna need a small flat blade screwdriver and gently pry.
My issue is: fan motor changes to every speed. Changes to every air location(Floor/vent/Def) I just do not seem to get much air out of F/V/D. I hear all actuators moving and air does come out. I do not have cabin filter(Checked). Any solutions? My thought was maybe blower is powered backwards. Or is their something that is restricting air. Thank You for your time. 2002 Trailblazer Lt.
I would guess a few things, heater core or evaporator clogged with debris, or blend door not fully opening/closing, blower squirrel-cage damaged (usually accompanied by noise.)
hey alex i did the evap hack and still has a small leak any suggestions on how to stop it
No, beyond my knowledge
Thank you so much! Was just about to pay my mechanic $75 when it was just the loose connector
Thanks for watching.
Those plugs plug into the xm radio controller don't hurt nothing if you don't have it
Good to know. Thanks for watching.
Would the resister cause both front and back blower motors not to work
Usually just the front, the rear has it's own circuit
Ok thanks
But neither work.
Replay is good
Fuse is good.
Still confused
Check power and ground at the blower motors.
Hello , I have a 2004 Chevy Trailblazer.When I turn me engine off the back blower continues to blow air until my battery goes dead.Can my fuse be bad, if so what fuse would it be? Thanks for your time.
Sounds like a bad relay, front blower and rear blower probably has the same relays. Swap them and see if the problem follows the relay.
Mine does that exact issue when it stops working I open the glove and jiggle the black cable that goes down to the resistor and it works every time but I'm going to hook a cable tie to it to see if it works well. Ps. I have changed the resistor twice before I figured out it was the harness.
Let us know how you make out.
We are having trouble with my 2005 GMC Envoy XL. The blower wouldn't shut off first so we replaced the Blower Motor Resistor now it works on high but on low after a few minutes it shuts off? PLEASE HELP!! We are frustrated!
Maybe check the switch
Hi, does that resistor also regulate the temperature ? Thanks.
No it does not.
@@AxlesGarage so he is referring g to the engine temp therefore the engine cooling fans?
Thank You Very Much for the Video, I love how you cleaned your wife's crap out of the glove box
Thanks for the kind words, Al.
I have a 05 Chevy ext and my ac works fine for the front but in the 2nd and 3rd row they only blow to the feet
Thats the diverter door actuator
cool. thanks. will check out my plug first.
Let us know how you make out.
@@AxlesGarage Hi: It turned out to be a burned out fan. resistor was ok as wee fuses. picked up a used fan motor & cage at a local junk yard. works great - and on a budget @ 50$.
I've got a 2007 trailblazer, my heat wouldn't really work through my vents, but it would work on dash, now it's not working at all. Please, help if you can.
Sounds like your diverter
My ac light comes on but nothing comes out. I’ve replaced the resistor before so I don’t think it’s that. Weird thing is that my rear windows, cruise control all stopped working at the same time. Any suggestions
That sounds bad. For everything to go out at once, it sounds like a module or relay. It's gonna be a bitch to troubleshoot.
Obviously check your fuses to see if those items all run off the same fuse. Check if they share a common ground. As noted test the appropriate relays too! It’s GM!
Obviously check your fuses to see if those items all run off the same fuse. Check if they share a common ground. As noted test the appropriate relays too! It’s GM!
I checked for power on the wire going into the blower motor, but got nothing. I checked the harness but only two out of the seven entry points lit up. What do you think could be the problem? I will say when my AC was going out, the compressor would kick and almost turn off my AC. Then the AC started to go out slowly and had to use lower settings starting at 4 down to 1 until it didn't turn on anymore. Five never worked. Any advice would be appreciated. Thanks.
Check for proper power and ground. Check fuses and fan relay as well. Good luck, it's tough finding wiring issues.
@@AxlesGarage Replaced the old resistor with a new one and it worked, even on 5 which never worked, but now I smell something burning.
@@AxlesGarage Update: Turns out my truck spills all of its coolant when I have the AC on. That's where the smell was coming from. Now to figure out why it's doing that.
Is it overheating and boiling over?
@@AxlesGarage No, it's not. I'll be checking for a leak later this week. There was no coolant in the reservoir though.
So... mine is burning the harnest i replaced the harnes and it melted it again any suggestions?
It seems to be a chronic problem, the harness is too 'small' for the amperage. I would suggest replace with an oem harness and make sure the plug connection is solid, even if you have to tweak the contacts a bit
How did you pull the plug out?
There is a clip-tab you need to press to release
Do you know by any chance where’s the blower motor ground
Not off hand, and I sold that vehicle quite some time below. Thanks for watching.
My blower motor has a yellow wire and a blue, which one is hot???
I would guess yellow, but you should confirm with a meter
@@AxlesGarage Thanks, I just wish it had a red and black like most things 12v!!!
Mine basically will work only when you move the wire, then it will turn off not long after, once I unplugged the wire it was melted but I’m scared if I only replace the part that melted that it will just melt again, so should I replace the wire and the part you plug the wire into? I’m not too good at this stuff but I did pretty good finding out what is wrong with it. If anyone could help message me please!
The replacement part is a little heavier duty. It shouldn't melt like the original, and if it does it will take years.
Mines something like that but air is coming out everywhere else but the top vents what could it be
You probably have a bad actuator that opens and shuts the flaps in the dash ducting.
@@AxlesGarage thanks
Mine actually melted the ground wire on the plug. I had no blower at all....
Yes, I am told that the wires melting is a big problem. I guess that's why the local parts stores keep the harness repair kit in stock. Thanks for watching.
hey what number fuses ?
adam pepin Every vehicle is different. A fuse legend is typically in your owners manual. Most owner’s manuals are now online.
Did this with my 05 trailblazer replaced Harness and the resistor a didn't have speed 5 this did nothing
Thanks for watching
Same problem loose wiring harness
Mine is gmc sierra blower stuck on why
I changed my resistor and my passenger door will not work, electronically. It turning signal does. Will not lock or window won't roll down
Sounds like you may have shorted something and blown a fuse
I didnt understand. You had voltage going to the blower at the beginning. so the blower should have worked. Had the same issue. First time was motor. Second time was resistor. the old one was almost melted.
The connector goes bad creating a loose connection. Once we 'tightened' it up with the zip tie...problem solved.
The wires on the resistor wasn’t making any good contact
Yes, thanks for watching.
I replaced the resistor and the problem remains. What is my next step?
Troubleshoot the power and ground
All newer cars are a poor design. The idiot designers took all the fun out of building cars and working on cars.
You are 100% correct
You did not show how to pull that plug out of the blower motor!!!!!!!!!!!!!! You put the camera down... No!!!!!!!!! I have spent thirty minutes trying to figure out how to unplug it. Come on!!!!!!!!
I figured it out... 😏Finally... 😊
Just a tab to release like most automotive connectors
@@AxlesGarage Yes, sir! The exclamations were frustration, and not to be taken as actual anger. Just... watching... then.. What!? But, yes I used a small flat head to get it . All good . Thanks for taking time to reply.