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Hello Everyone, So i am having an issue with my 2007 Cadillac DTS. The engine is running extremely hot, however the temp gauge is reading normal. Coolant Reservoir boils and smokes with cap off, and leaks with cap on due to too much pressure. Fans are not kicking on. Block test came back negative for blown head gasket, but the coolant reservoir was so hot it warped the plastic on the block tester. What would be the next culprit to look into??