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My car is a '04 civic with ~140,000km. Last year my a/c stopped blowing cold air. Sometimes it would cut in and blow cold air then gradually never worked at all. My compressor doesn't cut in at all. I brought it to a garage the mechanic figured it was low and needed to be recharged. He checked it and it was down a bit on pressure, so he refilled it and still don't work. He said that the computer was reading that there is no pressure in the system. Also he tested the compressor and it was fine. Anyone know what could be causing this?? Thanks.

 
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Check thermal protector - it's very common problem.