1992 Cadillac Brougham 5.7 liter engine with a R-12 refrigerant ac system, 53,000 miles. The system is fully charged but at idle the compressor will disengage and not start again unless, A) I high rev the engine. B) Tap on the canister molded onto the high pressure hose where the connection for the manifold gauge hose would attach. Am I dealing with a contaminated system? Any advice appreciated.
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Wednesday, October 20th, 2010 AT 6:19 PM