Audi Repair Questions? Ask a Mechanic for Answers ASAP
You need to verify the compressor is coming on or not. Also you will need a high end scan tool to get into the hvac system and check for codes and look at live data of the temp sensors. You have multiple temp sensors and if one fails it can prevent the compressor from turning on. You could also have a bad pressure switch which would also prevent the compressor operation. You need a good set of ac manifold gauges as well, you will need to check the pressures of the system. High and low side pressures are important for diagnosing this problem. Without the proper diagnostic equipment this will be hard to diagnose.
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Hello again Dan here,
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