What causes a 95 Cadillac STS to overheat the thermostat has been replaced and it only runs hot at high speed?
Microscopic crack in the head that will open up at high RPMs,
subsequently jettising the coolent and overheating the engine. Have
the heads X-rayed, than have a good aluminum welder weld it.
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What causes a 1992 Saturn SL1 to have a high idle and overheat even though the thermostat and water pump have been replaced?
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