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

it. but no oil in coolant, or coolant in oil

Asked by for the 2005 Pontiac Grand Am
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!