Question about 1990 Chevrolet K1500

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Help just changed water pump and thermastat on my 90 chevy 350 temp goes up to 210 now and goes back and fourth from 140 to 210 did i put the belt on wrong or something else.

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I don't think you do any thing wrong. I suspect the coolant temperature has a loosed connection, or it is bad. If you are certain that your coolant temperature sensor is good then remove the thermostat to run for 2 days to see the temp reading gauge is normal then buy a new one to put it back. Good Luck.

Posted on Nov 15, 2009

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