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Question,
what causes an air conditioner to work fine when going down the hyw, but blows warm air when you are setting in traffic or idling?
I also noticed that my compressor makes allot of noise.
If the compressor is OK, there is the possibility that the fan clutch is bad. When you are driving down the highway, enough air flows across the condenser that adequate heat is removed from the refrigerant without the fan. Also, make sure there are not a lot of bugs, leaves, etc. plugging up the condenser.