How to fix Audi A6 Climate Control (HVAC, Heater unit). 

For over a year I was going through a nightmare with my aircon. Last trip to Poland from Uk was hell on earth. Thanks to you my problem is GONE! I took the part off and cleaned it with clutch cleaner in a spray! It works perfectly! 2h of work it was and Im not a mechanic. Audi said £250 just for the part. Thank you, thank you, thank you, god bless you good man!:D verry happy now and soon going to Poland like a boss again! ;)

Had the same problem on my 2005 A6 3.0 Quattro. Initially stripped off the solenoids and cleaned them, fixed the problem temporarily. In the end, I also had to replace the HVAC control unit. Excellent video - helped me so much. Thanks.

i did this to my 2009 2.0t a6 c6 tfsi also. it is getting better but also found out my orifice tube are dirty so pay another US5 for parts replacement. Super cool now

Thank you so much for taking the time and effort to do this. I'm sincerely grateful. Just used the quick method. 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). Use a magnet on your driver to avoid dropping the screws.

Feel free to share as it is all about getting good information out there by any means. If I do it again I will post a video. Thanks to you for posting your vid as it helped me locate the problem in the first place

I would like to thank you very much again. I had tried to solve the problem, but I was not successful. However, after watching your video, I was able to remove a problem. Thank you so much one more again :)

Helpful video....fyi pliers exist that are specifically designed for "spring" hose clamps. They are typically pretty long and allow for much needed articulation. Worth every penny

Very nice and usefull video. Thank you for this.

Dzieki serdeczne stary , Great job

Great simple solution to a crazy problem thank you so much.

If you want to service the 2 pistons yourself you can do it yourself WITHOUT taking off any pipes or electrical fittings. I have just done it myself. You will need the appropriate sized torx driver. Care must be taken when removing to two covers on the pistons as a piston may come out with the cover and fall down the back (not a nice feeling just ask me lol). Once both covers are off you can carefully remove the pistons and clean up any residue or substance on the hardened chrome surface. Make sure you keep note of which one went on which side. Not sure if it makes much difference but better to be safe than sorry. You can then separate the lower assembly and will see 2 conical shaped brass valves. Ensure that where the valves and the seats for the valves are both free from any residue, obstruction or build up. Then it is just a matter of reassembling everything. Make sure that the valve stems are sitting absolutely vertical before putting the bottom stage on. I had a problem screw also that may have cross threaded so be very mindful of that too. If it is too tight to start off with try again. The other thing that may be helpful for this and other jobs such as this is to have a rare earth magnet handy for when you are pulling the screws out. If you position it near the screw as you are lifting and it slips and starts to fall the magnet will generally grab it. Just a fail safe. Mine is working well now. Don't forget to check for leaks around the pistons after a run up to temperature. You may need to torque them down again. I did it this way as I just couldn't seem to get in to get the hoses undone as the fittings were out of reach. Always good to make sure the go back in a position you or someone else can easily get to. Hope this helps.

Thank you for your videos! They are very helpful.

I just bought the same unit brand new haven’t installed it yet but to comment on taking it apart your really better of replacing with a after market one for 50$ the screws are most likely really brittle and will break for sure either during or after removal thanks for this video tho you make it look easy peasy lol

Very useful, man. Many thanks!

Thanks for the info my friend! Very helpful !

You are great 👍 and I am thankful for such good job you did!!!

I noticed my ac wasn't blowing cool/cold air today (90°). I'll give this a shot. My car has about 80k miles. 2008 Audi A6 Quattro.

Thank you

Same problem I'm having!!! Ty

I did it today , i had only 1 week from refill with AC and it had warm in both sides and cool in middle , i did this and it works perfect

thank you for your video very useful thank you

Thanks for this video and you are right most mechanics don't know what they are talking about and take you for a ride. I have a A8, same problem. Should I take out my control module for heater and clean?

Thank you mate nice vidio 😀😀👍👍👍

Thanks for these videos. They have saved me $$$$ on my '06 A6 4.2. One question I have on this is the fluid. I don't see any mention of refilling the fluid that leaks out when replacing the unit. Is there a need for this or is it just then normal engine coolant?

I just broke a bolt when I tried to put it back. Do you think there is a problem if the system works without a bolt? Thanks!

Thank you for the video! I have a similar problem, but not exactly the same: my cooling/ heating unit is cooling left and heating on right, when it is warm/ very warm outside. I changed the unit, but it didn’t really fixed the problem. I ‚m looking for a solution. By the way: it is a good idea to replace the cooling liquid, when the new or cleaned unit is reinstalled. It could be 1/2 liter or more you loose during change process.

Bogdan Pop, for some stupid reason youtube doesn't allow me to reply to your comment. I'm gonna reply by this new comment - hope you'll see it. Now back to bolt. It depends on what kind of bolt we are talking about - if it's a bolt holding bracket - I don't see that as a problem. If it's one of those T10 bolts, holding solenoids, then it can be problem - your unit likely will leak - and you'll be loosing your coolant liquid. I had same problem (see my website), therefore I warned in my video to be careful with them.. My advice - get new bolt - it all needs to be tight.

Great video, thanks for sharing! If the problem is faulty/stuck magnets would it be possible to remove just the magnets from top of the unit, without taking the whole unit out? The magnets appear easily accessible when the unit is seated in place.Thanks.

Good job but if the AC screen and buttons function but no cold air is the same?

Really interesting video. Thanks. My problem is with a 1998 A6 and is that the heating is not working. Coolant levels have been checked but doesn't seem to make any difference. Could this unit be the cause of the problem ie it is sticking in the closed position. Really annoying especially as only one of the front seat heaters are working. Don't want to spend too much bearing in mind the age of the car. At the moment on cold days I let my wife drive as its the passenger seat heater that works!!! Thanks for any help you could give.

Hi Great video thanks, do you think this unit would cause the "01592 - Air Quality Sensor (G238)" fault on a Q7 ? Regards Yas

I have a C6 A6 with the 4.2l V8, Im having issues with the A/C blowing hot reguardless of what the temp is set at. Mechanic said it could be the Evap. Temperature Sensor.... Any help is appreciated !

Pls Do have anything how to fix system for cleaning the windshield, water tank etc

Hi I want to ask you a question. My Audi A4 1.9 tdi 2003 model Ac is blowing only hot air And the radiator fan not coming ON when AC is on. What can you recommend Thanks

Hi there I have the same problem only its blowing out cold are even at full temp ! Would this be the same unit to replace? It's a 2 litre diesel 57 plate a6 avant? Thanks

What if the a/c isn't working? I have an 06 audi A6 3.2 quattro and the ac stopped working recently after a hot day. I remember about 2 year ago i replaced the compressor. So it shouldn't be that. I have researched online and found that maybe its throwing a code and could be cleared? Or maybe my cabin filter? And also a relay switch. Not sure but its a heat wave on the east coast and im dying. Appreciate any insight.

Does it help the heater to warm up more quickly in winter ?

Will i see this on fault codes if one of those valves are stuck?

I am having trouble with my windshield steaming up on the exterior side..ac on in car an its 90+° out side..I hav to have windshield wiper on to keep it clear..an defrost on warm temps....wat's going on with this

Hi everyone I think I have to clean my valves too , I just want to know should I bleed the air out of the system when I am done. I saw there is a air bleeding screw on the outlet house. Thank you

I'm looking for info on repairing rear defrost and/or a/c cuz I don't get cold air and glad is fogging 🤘⚽✌

nice video! i change that pice with a use one...and same problem... i will try to fix the old one and try to see if the problem persist... you have a video, or you can make a video with update the Interface_Box SW Rel ? my audi 2005 has SW Rel C6Std_0130 H15 and i want to update to 0410 four mp3 interface adapter A2DP. Can i do it? ..i ask around and no one knows ! Cheers Darius

How do you bleed the system? I've got air in mine.

Hi .In my car besides the problem with the high temperature in the car, in the board I have as a display the temperature up to -38 ° C. Is that the same problem with this car?

Hello mate, i got a audi a6 c7.5 2l ultra. 4 zone clima control, and drivers side just blows cold air passengers side worm. Can be that heating valve problem ?

Does this control heated seats also ? my heated seats don't come on b7 audi a4

its video audi s4 compressor replacement

Does this problem also affects AC not doing cold enough? Or just heat?

also you can just take off two of that pipes clean it inside and put back on :)

on audi 05 lost horn and steering wheels control,change e relay and clock spring but did not solve problem

mY 2014 A4 all road is acting strange sometimes the heat barley works and then nothing. The A/C is also working randomly. DO you think Rods solution will help me? thanks

Sorry,I have question again. How to how to make that audi a6 2005 blow much stronger wind than it is?

Hi Im having the same problem on my audi a3 8L blows only hot air! Is fix the same for my car any thoughts?

Hi i have a problem with my climate control at audi a6 c6 le mans edition 3.0 quattro some times i set the climate to cold and after some time on the left side start to flow hot and on the right side is cold the error on VCDS is 01207 can't communicate with aux heating after this if I stop the engine for 10-15 minutes is work good. Can be this problem from this unit? Thank you I hope to have a response from you.

does this work for the 3.2 ? i have this car but it’s not blowing cold air or hot hair the fan doesn’t kick in and the econ light is on

Just made a clip of how I serviced mine and have a link. Hope this helps someone and saves them some money. Thanks to wheelsandmotors for his video to show me where the problem was. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BlreVXqA390.html

Hi i am getting no heat/air at all, checked fuses, heater blower and resistor and there all ok, any opinions would help, could it be the heater pump as there is a ticking noise coming from it when i switch on the heating

I have a a6 c7 -2016 with no heat coming out. Engine temp is normal. Can it be this kind of unit failing for me as well?

I have a 2010 Audi A6. My AC/Heat fuse keeps blowing and I have hot air coming from my vents even though my system has no power. Help!!!!

I have almost the same problem. Sometimes I don't have hot air at all and othertimes I have full hot air no matter if I have it to low degrees or hi. Maybe is that thing???

idony know if you could reply but im having same problem with my 2007 3.0 tdi allroad , and the problem is that i hear water noise on the tubes from the dashboard and i only get cold air and only when i go above 3000rpm i get heated air , otherwise its always cold air is it thr same unit that i have to clean or replace ?

Hi my audi a6 c7 2018 driver side blow cold air and passenger hot when turn on full heating on climate control. And from driver side can hear noise very light tiktik for few seconds, i did diagnos no error came any idea what will be cause plz help

hi there! have a6 c6 , temp in morning so slow reaching 90degrees, could it be bad thermostat or any other thermostat valve need to change?

i have issue with my heater. I think i have problem with same thing because when i drive over 2000 rpm that blow nice and warm but when i drive lower than 2000 it blows cold air.

Hello i have nearly the same problem just on reverse its blowing on driver side just cold air is that could be the same problem?

direct drive

I have a problem. There was coming boiling water from my climate system (Audi A6 Avant 2001), what could be the problem?

I have same problem with a4 b7. Climate control works fine until I put it on full heat for a while. After that valve stucks and it blows only hot air. When I stop car for few hours and let everything cool down, valves keep working. But I found that valves located under steering wheel and glowe box. Give me some video for my problem solving

Hi! I have a 2011 A3 and I have the same problem. I don't know if its exactly the same as my problem, in my case i get hot air only on the drivers side, the passenger side is still controllable...do you think I might have the same problem that you mention?

HI, great videos by the way! I have a quick question. I have an A6 saloon 2010. There is no hot or cold air being blown into the car from the vents when i turn up the fan control. All electrical switches work fine, heated seats, heated rear windscreen. Only the air blower button is not responding. The button itself does respond on the readout and display. Would this be an issue with just the blower unit or something else also?

Hi, i have audi a6 c6 07 2.0tdi the heating working,when im pressing aircon button,all setting on MMI working except fan speed. No cold air no hot air,just seems like outside air.Shuld this steps help me? Compressor got gas and pressure.

Hey. I like your video a lot. I have kind of the same problem, only mine is blowing COLD air all the time in one side. Is this the fix for my issue? I wouldnt mind not having to replace the entire unit :)

Hi, I have an audi a4 with no heat. Garage has it for 2 weeks with no fix, flusher heater core, replaced water pump etc. Could this be the cause of no heat as well as heat up to the max ??

Is it the same part problem for an audi 2013 A6 that takes too long to blow hot air, about 30 minutes ???

I have a 2003 A6 2.7T. The a/c doesn't blow air at all? What could be the problem with this??

My 2009 Audi A6 originally was not blowing cold air with aircon on but now the fan isn't blowing at all through the vents (maybe ever so slightly) if I turn the heat up I can feel the air getting hotter just won't blow strongly. Any ideas?

Very interesting video , I hope you are still active lol . However my Audi 07 a6 is blowing out hot air , no ac what so ever . Would this work for me ?

Where do I get the part I need done to my a8l

Can you please tell me where the ac compressor relay is located for Audi a4 quattro with turbo 1.8 liter 2002 model

How i change the fog lights on 06 audi wagon a6

I have a problems with my heating, left side blows cold and right side hot as set to blow hot, can it be the same problem or?

the 4.4 is a different set up, the compressor is facing the cabin, theres isnt a belt,

Hello guys, I have an Audi A6 4F2 and i have problems with my radiator fans. The small one doesnt work and the big one runs in 2nd gear or something (runs too fast and loud)....If anyone know what is the problem pls answer. P.S. i checked the small one at a 12 v battery and works but at the car doesnt run.

I have no heat coming out anyone help

I still have same problem

În română, nu există?

2004 to 2008...heh but nevermind the producers official data

are you can just go too. auto sense auto repair and tire, you tube page....

so you don't have video how to FIX it? :))))))))))

Lithuanian subtitles please!

Stocked on Amazon for a good price: www.amazon.com/gp/product/B016XZ837W/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1