Is the electric radiator fan working when you have AC on? Check the pressure with VCDS when it's on to make sure compressor is providing enough pressure. Could be stuck flaps in AC not moving and directing airflow correctly, maybe dirty/ blocked condenser or evaporator.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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