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I had a 89 k1500 w a 5.7 L eng that had the same prob with out being rebuilt. turned out the head gasket was leaking and the coolent had air in it. the coolent was rust colored from the leak. you might also consider replacing the thermostat first and see if it will solve the problem. good luck

or replace radiator

if the cylinders are bored .060 over the cylinder walls are too thin. this will cause overheating.

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โˆ™ 2009-10-04 04:58:48
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Q: Why would a 5.7L engine overheat intermittently in a 1989 Suburban after being rebuilt?
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