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Just went through it, sorry it's not good news but, head gasket. Didn't realize because the symptom's didn't match. It wasn't smoking or showing water. It was a pinhole spot. You'll may need new heads too if the aluminum got too hot. Good Luck

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Q: What could cause your 1999 Cadillac deville to overheat i change the water pump i took out the thermstate.i got the radiator rod out.do i have to put the thermo back in the?
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