A fairly simple and straight forward fix the problem of the valves sticking inside the control unit causing hot air to pump out into the cabin even when the temp is set on low.
Hi Rod, I know I'm late to the party but thank you so much for taking the time and trouble to post this video. I have a high mileage A6 which developed this very problem some while ago. It was intermittent so I didn't bother about it too much. Would normally happen on the hottest of days! By turning the heater up full then down again the problem cleared itself. I have followed your instructions and cleaned out the valves, so far all is well. In answer to an earlier comment the rubber seals sit underneath the two coils. They are a bit like the sort of rubber seals found in household stop cocks etc. Keep up the good work.
Your video helped me so much without I don't think I would have attempted this fix...thank you so much! Also for anyone else who tries this really make sure you are careful with those screws even with a magnetic bit one fell and it took me almost an hour just to get it back out...so be careful!
Rod that was so informative, thank you... what a save!!! It's true, every garage will say the same, a big job requiring taking the car to a thousand pieces followed by a million pound receipt in labour and parts. But this is brilliant. And thank you Rod. And thank god for youtube!
I followed your video to the letter. Having a magnet handy as I extracted and replaced the torx screws was a brilliant idea as I am the biggest klutz in town and would have surely dropped them. That said, this was an incredibly easy repair. For $9US, the cost of a magnet and 2 cans of carburetor cleaner my ac blows cold again. I had taken it to 3 different shops, who each ran diagnosis. Three different prescriptions, none of which was either cleaning or replacing this control unit, for repair. All in excess of $1,000US. Thanks for posting.
Thank you so much for taking the time and effort to do this. I'm sincerely grateful. Be careful when screwing the 6 little screws back in to hold the metal lids on the valves. They are self-tappers screwing into plastic, very easily cross threaded. I snapped one with only very moderate force using a screwdriver style Torx10. (Had to drill and tap a new hole as I couldn't get it out). The magnet idea is a life saver.
Great video. I have an Audi A6 2008. The ac was blowing warm air so I decided to do some research and find out what's wrong. After watching your video I went out and did the same to my car and boom...the ac is blowing cold air again. Thank you so much!
Glad you were able to fix your A.C. My issue is that the ECON light on my 2006 a4 Quattro is constantly on, and the fans blow, at best, warm air, or hot if I turn up the temp. Did you have the same issue? From looking around I'm hoping it's something easy like this. I'd appreciate any input!
WheelsAndMotors Thanks for your inspiration on this. We all help each other with ideas and solutions to problems. I am glad that people are getting something from this
Hi Rod, can you please advise if I will loose coolant when I open this valve? If so will the car require bleeding? Also how long should I soak the parts in vinegar? Your assistance is appreciated.
Do you know if its normal if i get temp up quick but not HOT air coming in to the cabin even when put on HI, also when outside start raining my windows fog up quickly, once i turn on AC, they are fine, but without AC on , even i put cold blast or warm, windows getting fogg up soo quickly.. only chance is to run with AC but on cold weather i dont want to do that :(
hi thanks for this video, I do that this morning, no result :( Icy cold on the passenger side, less cold on the left dashboard, warm on the left of the steering wheel, and warm on the right of the steering wheel.... Isn’t it a breakdown panel in the console that makes you sweat? Or is the module dead ...
Thanx for help. Just finished repairing same problem on my audi a6 2005. I've managed to brake brown slim thing on brown-goldish thing that controll the flow (04:50 - 04:58). Damn. I hope glue will do the job! P.S. Does anyone got a spare valve???
If you wanted to remove the electrical connection the easy way to do it is push the electric plug on a bit more and the use a small screwdriver to release the clip and hey presto the electrical connection will come off easy just a tip for all vw Audi group electrical connectors
A very Helpful video,, i think i got the same problem but in my 05 A6 3.2 FSI i m getting more hot air in the side vent as compared to the center vent....Do you cleaned under the Magnetic coil around the Valves(cylindrical housing) shown in video at 4:30 .
Jaspreet Chahal I cleaned the valves and carefully cleaned the valve seats but you have to be really careful not to use anything abrasive that will take part of the metal off as it will fall straight into the cooling system. It will only let minimum water through anyway unless it is severely built up, so it wont be an issue. It is only when the valves are stuck wide open and you have full flow that you have the issue. I just cleaned the valves for the heck of it whilst I had them out. Hope this helps.
Hello. I guess I am experiencing the same problem with my 2005 year A8. AC is turned on to LOW temperature, sometimes it works but sometimes it flows hotair instead of cold air. As you know A8 has dual zone climat control and this happens sometimes to the passanger side and sometimes to the drivers side. Sometimes both sides flows hot air. Is this the same problem that you had?
Great video! I have an 2016 A6 c7 with no heat coming out, even though it has normal engine temperature. Can it be the same device not functioning for me?
Per Bjerg If the heating is ok and the cooling isn't it is more than likely need a regas on the AC. This fix will NOT help that problem. You will need to take it to an Airconditioning repairer.
Rod Thank you for your reply. When abroad I had a mechanic looking at it and the tube going into the cabin it is cold. The mechanic told me he had to remove the whole dashboard at middle console to repair it. His english just wasn't good enough to explain what is wrong. I'm just looking for an explantation on what really is wrong with the AC and hopfully an easier fix.
Hi. I have A8 2003 4.2. My problem is a bit opposite, Audi doesn´t heat into the cabin the warm air(half-warm yes, but not warm). I have to set HI temperature to be "normal" temperature. Could it be this?Should I try to clean the valves like at A6? Thank You
+Veroslav Lenc It could be a similar problem in reverse. You could try this and see if it makes it better. The valving just controls the flow of the water from the radiator through the heater so the valves could be stuck in the shut position. The other thing to check out would be that your coolant levels are OK. If you don't have enough coolant in there you wont have enough fluid to flow through to your heater circuit. If you are adding coolant make absolutely sure that you are adding the correct one. Try all this and see how it goes
@@rodnette3 Hi are you still replying to this clip of yours I'm sure after watching this I have the same problem which is 1 of many with my 2007 brd engine in an A4 the other problems are drenched relays under my ecu which the workshop I sent it to hadn't diagnosed in 5 months of having the vehicle I've found out more on my own in less than 5 days of having it back
@@JohnSmith-uq4zp that is hardly surprising. Stealerships just want to throw expensive parts at the car at your expense instead of thinking through the issue. I have moved on from the Audi several cars ago now but still have fond memories of it. The HVAC issue was a downer on it though. I am not sure about your relays but that does not sound good. I would check if it is water or coolant and try and find where it is originating from, although I suspect that you have already done this. Could be as simple as a pin prick size hole somewhere. Have a look with the engine up to temp and running to see if there is any fluid. There may be a sign if it is spraying but water will generally follow gravity. Hope you find a fix
Hello please I have a question if you can help me My engine temperature only drops when running on hotI have previously changed the main engine thermostat The temperature on the engine is constant. But only when the air conditioner is heated to a high temperature go down to 70. Please, where can I start the search?
When you run your AC on hot you are effectively introducing another radiator into the system. This will explain why the motor runs cooler. I would start having a google around before throwing money at it. www.audiworld.com/forums/q7-discussion-112/3-0tdi-running-temperature-2942597/
@@rodnette3 When I turn off the ac button the temperature generally improves But also when operating a car air conditioning without AC The temperature also drops I think it's Vale coolant behind the engine I need your advice, thank you
@@alkhouli3591 I am sorry but it is extremely difficult if not almost impossible to remotely diagnose an issue such as this. It is a matter of elimination and you may need to engage the services of reputable HVAC person
If I may add only one thing. Those torx screws are really weak.Personaly, I broke one, not using too much force.So guys-be very , very careful(I was and ended up with broken one).If you get a chance go to the store and find replacement screws , that's even better.Those Audi torx screws are made from paper ;p Merry Christmas :)
Oops, just wrote the same thing. They are outrageously weak. They cross-thread about 3 times out of 4. DO NOT continue with a cross threaded one, even though it's not that stiff. It WILL snap.
emac I'm just getting around to fixing this issue on my high mileage 2006 A6. Issue being cold air in center vents, hot air in side and rear vents all when climate control should be cooling in hot weather. Is there a cleaning solution, other than soaking in vinegar that anyone has successfully used? Thanks all in advance
Same problem here. I turned on the heater and the side vent blow heat but the center vents blow cold. Im not sure if i should clean the valves like in this amazing video or i should replace the Air Conditioning Air Con Pressure Sensor. Does someone can help :(
I have the same problem, 06 A6, hot air on the outer vents, cool air in the middle vents. I tried this tutorial but didn't work... Not sure what else to try
OK Bender that is a different problem altogether, however I may be able to guide you. Your problem is that you are not getting any hot coolant flowing into the cabin from the sounds of things. First step I would try is to get the car up to operating temperature and with full heat selected on your dashboard feel the hoses that connect to the HVAC control unit shown in this video. You may have an obstruction somewhere along the line. Your valving on the HVAC control may be seized shut not allowing any flow of hot fluid through to the internal heating core inside the vehicle. If this is the case doing this and freeing up the valves will also remedy your issues. However it is very hard to diagnose problems, such as this remotely. Hope this helps you
@@rodnette3 thanks mate. I actually tried that after work last night on the way home. It worked. What im finding is that if I have it at full heat (hi) it blows fine, and if the weather is really cold and I put it on say 23.5 degrees. The aircon heat works fine, until the cabin temp picks up alittle, then it starts blowing cold, if I keep ramping up the temperature it blows hot again, but then starts blowing cold. So if I leave it on hi, it blows hot. It almost like theres an issue with the cabin temperture reading or something. Thanks for the help though mate. Bad luck with the footy on the weekend too.
@@ej4439 it does sound like you have a thermo sensor issue there. I haven't struck that one and seeing my beloved A6 and I have parted company i guess I never will. As for the rugby well what can I say other than the better team won. The wheels have fallen off the aussie ra ra side
If u are showing this why just do it step by step so we can see how you remove the items piece by piece so we can Learn the right way and put them back step by step thank you
It was never intended as a step by step instructional clip. It does have enough information contained in it to easily complete the task. If you are struggling with what I have put then I would suggest that you shouldn't engage in this job as you don't have the skill set needed. Remember that I went searching for the issue with my vehicle and had NO instructional video or help at all and was in fact feeling my way with it. I hope this may help you understand
This is for the engine mostly, to fix the A/C goto Walmart and buy this EZ Chill R-134a Auto AC Recharge Kit with Leak Sealer Plus - 18 OZ, and attach the hose to the aluminum pipe and pump the ac fuel back into the pipe. Do this while your car is on and heat on at full blast. Thank me later 😊
![THE TOYS x NONT TANONT - ดอกไม้ที่รอฝน (spring) [Official MV]](http://i.ytimg.com/vi/pPa1d5cC8M4/mqdefault.jpg)
Hi Rod, I know I'm late to the party but thank you so much for taking the time and trouble to post this video. I have a high mileage A6 which developed this very problem some while ago. It was intermittent so I didn't bother about it too much. Would normally happen on the hottest of days! By turning the heater up full then down again the problem cleared itself. I have followed your instructions and cleaned out the valves, so far all is well. In answer to an earlier comment the rubber seals sit underneath the two coils. They are a bit like the sort of rubber seals found in household stop cocks etc. Keep up the good work.
Your video helped me so much without I don't think I would have attempted this fix...thank you so much! Also for anyone else who tries this really make sure you are careful with those screws even with a magnetic bit one fell and it took me almost an hour just to get it back out...so be careful!
Rod that was so informative, thank you... what a save!!! It's true, every garage will say the same, a big job requiring taking the car to a thousand pieces followed by a million pound receipt in labour and parts. But this is brilliant. And thank you Rod. And thank god for youtube!
I followed your video to the letter. Having a magnet handy as I extracted and replaced the torx screws was a brilliant idea as I am the biggest klutz in town and would have surely dropped them. That said, this was an incredibly easy repair. For $9US, the cost of a magnet and 2 cans of carburetor cleaner my ac blows cold again. I had taken it to 3 different shops, who each ran diagnosis. Three different prescriptions, none of which was either cleaning or replacing this control unit, for repair. All in excess of $1,000US. Thanks for posting.
Thank you so much for taking the time and effort to do this. I'm
sincerely grateful. Be careful when
screwing the 6 little screws back in to hold the metal lids on the
valves. They are self-tappers screwing into plastic, very easily cross
threaded. I snapped one with only very moderate force using a
screwdriver style Torx10. (Had to drill and tap a new hole as I couldn't
get it out). The magnet idea is a life saver.
Great video. I have an Audi A6 2008. The ac was blowing warm air so I decided to do some research and find out what's wrong. After watching your video I went out and did the same to my car and boom...the ac is blowing cold air again. Thank you so much!
OOrtiz87 My greatest pleasure. It is good to pass on helpful fixes such as this. Don't forget the thumbs up.
Glad you were able to fix your A.C. My issue is that the ECON light on my 2006 a4 Quattro is constantly on, and the fans blow, at best, warm air, or hot if I turn up the temp. Did you have the same issue? From looking around I'm hoping it's something easy like this. I'd appreciate any input!
+SniperPFL you sound like you need to get your ac checked. it could be a number of issues and without actually seeing it, it is hard to diagnose.
Thanks mate, very helpful!
Amazing video :) Nicely done, looks like you thought of every little step!
WheelsAndMotors Thanks for your inspiration on this. We all help each other with ideas and solutions to problems. I am glad that people are getting something from this
Excellent instructions!
You're a star thanks it worked :-)
Manny thanks for the video, great job!
🔧I understand that you polished the surface and that's it.
🔴I recommend it. to throw out the ring.
Hi Rod, can you please advise if I will loose coolant when I open this valve? If so will the car require bleeding? Also how long should I soak the parts in vinegar? Your assistance is appreciated.
my AC blows cold but will this help incase there is no enough HEAT in cabin when put temp on max?? thanks
Do you know if its normal if i get temp up quick but not HOT air coming in to the cabin even when put on HI, also when outside start raining my windows fog up quickly, once i turn on AC, they are fine, but without AC on , even i put cold blast or warm, windows getting fogg up soo quickly.. only chance is to run with AC but on cold weather i dont want to do that :(
hi thanks for this video, I do that this morning, no result :( Icy cold on the passenger side, less cold on the left dashboard, warm on the left of the steering wheel, and warm on the right of the steering wheel....
Isn’t it a breakdown panel in the console that makes you sweat? Or is the module dead ...
you shouldn't lose much if any coolant and there is no need to bleed the system. if you can soak for a couple of hours that would be good.
Thanx for help. Just finished repairing same problem on my audi a6 2005. I've managed to brake brown slim thing on brown-goldish thing that controll the flow (04:50 - 04:58). Damn. I hope glue will do the job! P.S. Does anyone got a spare valve???
If you wanted to remove the electrical connection the easy way to do it is push the electric plug on a bit more and the use a small screwdriver to release the clip and hey presto the electrical connection will come off easy just a tip for all vw Audi group electrical connectors
Good advice about the connectors however some of these in spite of what you are saying proved to be very difficult to remove
A very Helpful video,, i think i got the same problem but in my 05 A6 3.2 FSI i m getting more hot air in the side vent as compared to the center vent....Do you cleaned under the Magnetic coil around the Valves(cylindrical housing) shown in video at 4:30 .
Jaspreet Chahal I cleaned the valves and carefully cleaned the valve seats but you have to be really careful not to use anything abrasive that will take part of the metal off as it will fall straight into the cooling system. It will only let minimum water through anyway unless it is severely built up, so it wont be an issue. It is only when the valves are stuck wide open and you have full flow that you have the issue. I just cleaned the valves for the heck of it whilst I had them out. Hope this helps.
What should be used to polish the internal pieces that were cleaned with white vinegar? Thanks
Matt Long I can't remember what I used but nothing more than the 2000 wet and dry used wet
Hello. I guess I am experiencing the same problem with my 2005 year A8.
AC is turned on to LOW temperature, sometimes it works but sometimes it flows hotair instead of cold air. As you know A8 has dual zone climat control and this happens sometimes to the passanger side and sometimes to the drivers side. Sometimes both sides flows hot air.
Is this the same problem that you had?
Yes this is the exact same problem and although I don't know the A8 setup I would imagine it is very similar if not exactly the same.
HY rod can I use a6 heater vavle on a8 kuz I'm getting the feeling I can just need lil conformation
Anyone have an idea where this is located for a 2007 Q7?
did you ever find out? i want to know for a 2011
Great video! I have an 2016 A6 c7 with no heat coming out, even though it has normal engine temperature. Can it be the same device not functioning for me?
That is entirely possible. The heating system is dependent on coolant flow through the cabin heat exchange unit. The valve system controls this flow
@rodnette3 great! Thank you. I will start with checking this out.
? Will a 2007 a6 heater vavle control working a 2007 a8l heater valve coni need to no
best to ask an audi spare parts dealer
My heater is working ok - but I get no cooling. Would this help me too?
Per Bjerg If the heating is ok and the cooling isn't it is more than likely need a regas on the AC. This fix will NOT help that problem. You will need to take it to an Airconditioning repairer.
Rod Thank you for your reply.
When abroad I had a mechanic looking at it and the tube going into the cabin it is cold. The mechanic told me he had to remove the whole dashboard at middle console to repair it. His english just wasn't good enough to explain what is wrong.
I'm just looking for an explantation on what really is wrong with the AC and hopfully an easier fix.
Hi. I have A8 2003 4.2. My problem is a bit opposite, Audi doesn´t heat into the cabin the warm air(half-warm yes, but not warm). I have to set HI temperature to be "normal" temperature.
Could it be this?Should I try to clean the valves like at A6?
Thank You
+Veroslav Lenc It could be a similar problem in reverse. You could try this and see if it makes it better. The valving just controls the flow of the water from the radiator through the heater so the valves could be stuck in the shut position. The other thing to check out would be that your coolant levels are OK. If you don't have enough coolant in there you wont have enough fluid to flow through to your heater circuit. If you are adding coolant make absolutely sure that you are adding the correct one. Try all this and see how it goes
@@rodnette3 Hi are you still replying to this clip of yours I'm sure after watching this I have the same problem which is 1 of many with my 2007 brd engine in an A4 the other problems are drenched relays under my ecu which the workshop I sent it to hadn't diagnosed in 5 months of having the vehicle I've found out more on my own in less than 5 days of having it back
@@JohnSmith-uq4zp that is hardly surprising. Stealerships just want to throw expensive parts at the car at your expense instead of thinking through the issue. I have moved on from the Audi several cars ago now but still have fond memories of it. The HVAC issue was a downer on it though. I am not sure about your relays but that does not sound good. I would check if it is water or coolant and try and find where it is originating from, although I suspect that you have already done this. Could be as simple as a pin prick size hole somewhere. Have a look with the engine up to temp and running to see if there is any fluid. There may be a sign if it is spraying but water will generally follow gravity. Hope you find a fix
Hello please I have a question if you can help me My engine temperature only drops when running on hotI have previously changed the main engine thermostat The temperature on the engine is constant. But only when the air conditioner is heated to a high temperature go down to 70. Please, where can I start the search?
When you run your AC on hot you are effectively introducing another radiator into the system. This will explain why the motor runs cooler. I would start having a google around before throwing money at it. www.audiworld.com/forums/q7-discussion-112/3-0tdi-running-temperature-2942597/
@@rodnette3 When I turn off the ac button the temperature generally improves But also when operating a car air conditioning without AC The temperature also drops I think it's Vale coolant behind the engine I need your advice, thank you
@@alkhouli3591 I am sorry but it is extremely difficult if not almost impossible to remotely diagnose an issue such as this. It is a matter of elimination and you may need to engage the services of reputable HVAC person
If I may add only one thing.
Those torx screws are really weak.Personaly, I broke one, not using too much force.So guys-be very , very careful(I was and ended up with broken one).If you get a chance go to the store and find replacement screws , that's even better.Those Audi torx screws are made from paper ;p
Merry Christmas :)
That is a good bit of knowledge. thanks
Oops, just wrote the same thing. They are outrageously weak. They cross-thread about 3 times out of 4. DO NOT continue with a cross threaded one, even though it's not that stiff. It WILL snap.
emac
I'm just getting around to fixing this issue on my high mileage 2006 A6. Issue being cold air in center vents, hot air in side and rear vents all when climate control should be cooling in hot weather. Is there a cleaning solution, other than soaking in vinegar that anyone has successfully used? Thanks all in advance
Ed McElveen same problem here. Did it fix your problem? Thanks in advance. Greetings frim Bosnia.
i have the same problem how to fix???
Same. Anyone had success?
Same problem here. I turned on the heater and the side vent blow heat but the center vents blow cold. Im not sure if i should clean the valves like in this amazing video or i should replace the Air Conditioning Air Con Pressure Sensor. Does someone can help :(
I have the same problem, 06 A6, hot air on the outer vents, cool air in the middle vents. I tried this tutorial but didn't work... Not sure what else to try
здраствуйте а насколько долго помогла прецедура етой чистки клапана?
Mate this is great, except I have the opposite problem. temp right up, but only blowing cold.
OK Bender that is a different problem altogether, however I may be able to guide you. Your problem is that you are not getting any hot coolant flowing into the cabin from the sounds of things. First step I would try is to get the car up to operating temperature and with full heat selected on your dashboard feel the hoses that connect to the HVAC control unit shown in this video. You may have an obstruction somewhere along the line. Your valving on the HVAC control may be seized shut not allowing any flow of hot fluid through to the internal heating core inside the vehicle. If this is the case doing this and freeing up the valves will also remedy your issues. However it is very hard to diagnose problems, such as this remotely. Hope this helps you
@@rodnette3 thanks mate. I actually tried that after work last night on the way home. It worked. What im finding is that if I have it at full heat (hi) it blows fine, and if the weather is really cold and I put it on say 23.5 degrees. The aircon heat works fine, until the cabin temp picks up alittle, then it starts blowing cold, if I keep ramping up the temperature it blows hot again, but then starts blowing cold. So if I leave it on hi, it blows hot. It almost like theres an issue with the cabin temperture reading or something. Thanks for the help though mate. Bad luck with the footy on the weekend too.
@@ej4439 it does sound like you have a thermo sensor issue there. I haven't struck that one and seeing my beloved A6 and I have parted company i guess I never will. As for the rugby well what can I say other than the better team won. The wheels have fallen off the aussie ra ra side
If u are showing this why just do it step by step so we can see how you remove the items piece by piece so we can Learn the right way and put them back step by step thank you
It was never intended as a step by step instructional clip. It does have enough information contained in it to easily complete the task. If you are struggling with what I have put then I would suggest that you shouldn't engage in this job as you don't have the skill set needed. Remember that I went searching for the issue with my vehicle and had NO instructional video or help at all and was in fact feeling my way with it. I hope this may help you understand
This is for the engine mostly, to fix the A/C goto Walmart and buy this EZ Chill R-134a Auto AC Recharge Kit with Leak Sealer Plus - 18 OZ, and attach the hose to the aluminum pipe and pump the ac fuel back into the pipe. Do this while your car is on and heat on at full blast. Thank me later 😊
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