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Originally Posted by 97candylacdevil I believe he may be asking how to tell if exhaust is escaping the cylinder into the coolant system (ie headgasket etc) i had a similar problem with my 97 deville and when i removed the cap on the overflow and tried to start the car it began to bubble over. ???????? hopefully that helps some... |
Exhaust cannot escape into the coolant. With a blown head gasket you would have coolant getting into the exhaust.
You would see this as white smoke (water vapour) exiting from the tail pipe.
Since coolant ruins O2 sensors, this would quickly trigger a check engine light.