Good morning, I have a 1999 Cadillac Eldorado and it is overheating. It begins to overheat when the air conditioning is on and the car is travelling at over 55mph. It has a new radiator, anitfreeze, good hoses, and all of that. The temp will go back down if i turn the heat on high for a while. I can't figure out what it could be, can you help me?
Optional Information: 1999 Cadillac Eldorado
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