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Q: can exhaust gas get into coolant by a bad head gasket and is there a dye to show on 2005 Pontiac Grand Am

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it. but no oil in coolant, or coolant in oil
(1) Answer
It can be tested for CO in coolant by having a combustion leak test performed. Most any auto repair shop should be able to do this. It does use a dye that changes color if CO is detected....but it takes a test 'kit' for testing!