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Hopefully, it's the thermostat... but, if the engine has seriously overheated it could be a damaged head gasket caused by a warped head. Engine heads will warp slightly when the engine overheats, then there is insufficient pressure on the head gasket and the gasket will leak.

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Q: 1994 cougar V6 is overheating what could be causing it no leaks in radiator and has automatic fan?
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