Hi. I am the new owner of a 2007 A4 Avant. I am confused about the 'auto' feature of the climate control. It seems that I can't get cool air by just setting it to desired temp.

Scenario

• Outside temp is being reported at 25.0 C (HOT!)
• Inside temps on the climate control are set at 18.0 C (Cool -brrrr)
• climate is set to auto. (red lights illuminate auto on both buttons)
• I can hear the condenser/motor? absolutely ripping behind the dash.
• Issue: no air is coming out the vents although the vents are cold ...
• Switch to Econ mode/middle vents (condenser shuts down).
• Cold air starts blasting out of the vents. (blowing the cold air that has built up)
• Cold air eventually becomes outside warm sticky air (expected)
• Switch back to auto (condenser fires up)
• Air from vents stops blowing

Any idea what can be the issue? I can only assume the compressor/condenser are working because when I switch to Econ mode, the air is absolutely freezing until after about 4 minutes it becomes the outside air temp. My car shows no error codes or error lights.

One thing I notice is when I set the temp to 'low' and auto the compressor is fully engaged but the flap motor behind the pollen filter is fully closed. WHen i switch it to Econ the flap opens. This issue is very confusing.

I am not great at vehicles.
Thanks for any assistance or opinion you might have.

Mac

 

Probably your hi/low switches have gone wonky.

 

While aircon is on, have you tried manually redirecting air in turn to just footwell vents, middle vents and windshield to confirm the internal flaps are functional- sounds like the vent control logic is messed up when in A/C mode

 

Hi. Sorry I didn't realize I had other replies than 'something must be wrong'. When I am in auto mode and click the middle vent it turns off auto and just goes to econ.
When in econ and hit the middle vent I get full air.

The other odd thing is that if it is say 27.5 outside temp (according to the dash display) and I set the auto temp to say 20.0 I get no air. The compressor is fully engaged but no air. If i then bring the auto temp up to say 25 I start to get some cold air flow (around 2 bars of fan). I can then slowly bring down the auto temp 1 degree at a time over about 10 minutes maintaining 2 fan bars of power. If I just drop it down, I get nothing. This is a very odd issue. Is there a way to reset the console? is this something that anyone has heard of before. The last odd thing I noticed was that when I spay the windshield with cleaner while driving, the air shuts off until the spay dries or is gone.

 

I don't have any other ideas, however if you PM me, we could arrange to get together and I can run a VCDS/VAG-COM diagnostic scan for you to see if the air-con module is showing any error codes.

I live over in North Vancouver.

 

Hi a4audi4fun.
Did you get my pm? I sent you my contact info.
thanks

 

Hi - did you ever figure this out. I have the exact same issue...although mine just started in 2024