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blown head gasket or even worse, a cracked head or two.. try filling radiator with fluid, then start it up. there should be a pressure relief valve on top of where you replaced the thermostat. crack it till it bleeds all air off, then there should be only fluid. gradually fill your radiator with fluid during this process. if water is spitting out of the fill hole, it's a cracked head

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Q: Why does my 1999 Oldsmobile intrigue run hot i replaced the thermostat. Whats else could it be?
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