Leaderboard

Hi, There could be a number of things causing this problem. If the PWM signal to the radiator fan ECU has a wiring fault (e.g. short to live) this could cause the problem. Also the engine ECU could be telling the fans purposely to run at full speed, if it believes something is too warm, due to a faulty temperature monitoring for example. However, seeing as you have also mentioned your AC is not working, I would suggest that your 'Audi mechanic' checks the measured value block for the air conditioning refrigerant pressure sensor. If this is reading too high, due to a faulty sensor or short circuit on the wiring, it will cause the fans to run at full speed and the air conditioning not to work (the compressor will be cut off as it already thinks the pressure is too high). Did you get this looked at by an Audi dealership or somebody claiming to be an 'Audi mechanic'? Tech