The problem could very well be your radiator fan. The electric fan runs when the a/c is on to help to keep the refrigerant cool after being pressurized. If this fan does not come on you will experience overheating in stop and go traffic because the air is not flowing through the fins of the condenser and radiator to keep it cool. These vehicle also had some problems with the fan clothes on the mechanical fans not working properly and making it sound like you are flying an airplane. If this is the problem you will need to replace the fan clutch assy.
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