I recently had my compressor replaced at a local mechanic. Since then the AC has been making a fog horn noise every few minutes when it is on. Also the AC it makes a different loud noise upon start up and when I slow down.
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1999 Volkswagen Jetta Question: AC making noise
Answer #1Visitor, July 19, 2010, 07:54
I just charged up mine 2004 Subaru. I tested the pressure and it showed low. Followed the advice for the low pressure reading to be in the BLUE 20-45 PSI while the engine is at a high rev. I had just done the same thing to my Jeep and its AC is now working perfectly. Guess what the Subaru is doing??? Making the Horn noise and cutting out. I will now bleed down the pressure some and see if that fixes it. From other online postings, it appears this has happened to others.