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350matt, Engineer - BEng Hons
Category: Audi
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Audi TT: I have a 2000 Audi TT the air conditioning blows cold

Resolved Question:

I have a 2000 Audi TT the air conditioning blows cold at first then turns warmer. The tech I had chech it out said that it was the compressor but with the research that I have done it could be other things that they probably did not check. Does the high pressure switch have anything to do with the air?

Submitted: 12 months ago.
Category: Audi
Expert:  350matt replied 12 months ago.

Hello

the high pressure switch is used by the system to ensure that there's enough gas in the system - otherwise it won't turn on the compressor - so its sounds like your's is OK

1st thing to check is that the AC rad / condenser is clear of any debris and there's nothing in front of the air flow to it, next ensure that the AC pump drive belt isn't slipping and if any doubt replace it. Also check that if there's a pollen filter to the cabin air inlet that this is clean and free flowing Next you can test components simply by checking the temperatures by touching them with the system running. with the engine at operating temperature and the AC turned on it should be as follows: A hot compressor / pump

 

A hot high pressure refrigerant line from the compressor to the condenser

 

A hot condenser on the inlet

 

A warm condenser on the outlet

 

A warm liquid line from the condenser to the evaporator (before the expansion valve or orifice tube)

 

A cold evaporator outlet line

 

A cold low pressure refrigerant line to the compressor

 

If you get a different result from the above then suspect a blockage in the line or the component whose temperature is abnormal, this can be confirmed with a pressure test

350matt, Engineer - BEng Hons
Category: Audi
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