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What condition is the rad in? On mine the lower metal corrugations crumbled when pressed. Regardless, because of age, it's probably time to get another newer rad or do a proper cleanout of buildup inside.
Does the overheating occur while moving? If so then another rad.
If at standstill or heavy traffic, then clutch fan needs replacing.
Turn on interior heat full blast to keep temp from going into red.
Last, some water pumps aren't as efficient at circulating as others are.
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1980 245 Canadian B21A with SU carb and M46 trans in Brampton, Ont.
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