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1980 Cooling System Problems

Engine

Vehicle Information: Year: 1980; Engine (size, modifications): 4.5; Total Mileage: 120000;

HiMy 1980 Stock 928 seems to be struggling with theheat. It's been abnormally hot here in NJ, howeverlately if my car stands still for more then 5 minutes the temperature starts rising. The radiator isfull and has no leaks. The oil level is perfect with no smoke. Any pointers would be great.Also ,it seems as if the Alternator is struggling to keep up with the CD ,Lights and A/C on. The belt tension is fine and I put a brand new battery in.Is it possible to put a bigger Alternator in?

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