Quote:
Originally Posted by Chris65LeMans
My guess is that it has something to do with the speed the compressor is turning - idle vs. running speed.
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I'm not an ASE-certified mechanic or anything, but from my experience, the poster above is correct. It's a common sign that your compressor is going out when it cools better at a higher engine speed than at idle. The higher engine speed spins the compressor faster making it work better. The knock you describe also confirms your compressor is on its last leg.