Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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the first thing I would do is to replace the thermostat. it may be sticking restricting coolant flow. other then that, I would suspect a clogged radiator.
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the other possibility is the radiator being partially clogged and when under load at high speed driving, it cannot keep up with the cooling. coolant over the years does decay and will clog the small passages in the core. you can use a temp gun to take the temp on each side of the radiator to be sure.