Estonia

Hi, I have issue with my heating - there is only moderate heat, about 15 degrees +outside temp. As outside temperatures go below -5 degrees celsius it is becoming an issue. The right side seems to be blowing up to 5 degrees colder air than the left side. There are no error codes, although I have seen errors "Indirect ventilation flap control motor 0014" and "074c rear right air mix fault" previously. I have changed the control valve module to a used one but both new and old one seem to be functioning. After few hours the car forgets about the +15 degrees is was blowing and starts to blow even cooler air as if it thinks the inside temperature is too high. Changing the desired temperature setting seems to have no effect and the control module seems to be aware of the issue not enough heat is being provided as the ventilation speed stays at 3 to 5. This seems to be heater core problem but I would like to check what do the internal temperature sensors tell the control module about the temperatures but I have found no information on what channel this information would be available. Also, the coolant seems to "go" somewhere at slow rate but no visible leakage.

Would be grateful for some insights.

dvs_dave

MP4.2+6.0

1. Post engine in any thread where it may be relevant--like here.
2. Search forum archives. Discussed periodically. See this recent thread for starters: https://www.audiworld.com/forums/a8-...moval-2964689/