Cadillac STS

What causes a 95 Cadillac STS to overheat the thermostat has been replaced and it only runs hot at high speed?

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2007-12-18 00:58:04

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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