HVAC issues

[QuattroMark]

Had my A6 C6 3.2 FSI quattro for around 6 months now - had a few minor issues along the way....but generally all good.

My latest issue, probably something to do with a change in the weather - The HOT/COLD controls seem to be all over the place - if I switch from hot to cold it stays hot for around 30 mins then slowly cools down - if i turn the engine off and leave it for 5 mins then turn back on the blower is cold.....however i have noticed that i can't get cold aircon to blow at all, the air is quite tepid- the system is pressurised it just seems that the temperature will not go low enough. 

It seems like none of the flaps are working correctly - I can hear them moving, or at least i can hear the motors running - Is there a way of resetting these?

And most recently i have noticed that during a long drive, after around 2 hrs the car just steams up- to the point where I have to stop! It will be like this for the rest of the drive.....however leave it overnight and the following morning it is ok - I am not loosing water and there doesn't seem to be any evidence of leaking into the car.

 

ideas anybody?

 

[robertbryan]

Perhaps your problem is with the cabin temperature sensor. Take it out and clean it with an electric wiper. The sensor is located under the key switch at the bottom of the instrument panel. Good luck.

[maryrick]

Tell me, what else do they teach at that school you recommended?

[maryrick]

It's too bad no one was able to answer this question. I have about the same problem. I am mostly annoyed that the air from the HVAC system is either very cold or very hot. I can't find a middle ground between hot and cold. It can be very unfortunate at times. I have to turn on the heating at regular intervals on cold days to avoid getting fried inside the cabin. I've asked a lot of car enthusiasts I know. None of them could help me. My last hope is a car mechanic friend who took a special HVAC course at https://www.hvacschools411.com/by-state/. I tried many options, even replaced the AC amplifier, which was quite expensive.
Anyway, you asked about it in 2019. Were you able to solve the problem?

Edited March 9, 2022 by maryrick

[PeterB111]

Hi All, can anyone advise please, where are the cabin teperature sensors located in Audi A6 C6 4F5 (year 2009, 2.0 TFSI, BPJ)? Tried to find it but no success so far. 😞

[cliffcoggin]

It depends what country you are in, which you have not told us.

[PeterB111]

Hi, country is Slovakia,but I doubt if this has any relevance. 🙂

[Marcin Z]

I'm not 100% sure, but my guess would be that it is located within HVAC control unit. I think it is fed through the tiny grill embedded in the fascia of the unit. Others will surely correct me if I'm wrong. 

[cliffcoggin]

36 minutes ago, PeterB111 said:

Hi, country is Slovakia,but I doubt if this has any relevance. 🙂

It has a great deal of relevance. The type of air conditioning and heating that is installed depends on the climate in which the car is sold. Cars sold in tropical countries have different aircon systems than those sold in arctic countries.

That is one of the reasons we ask for location in your signature and profile. I ask that you amend your location to something more sensible than B.

[PeterB111]

Thanks. Understood and amended.