Antifreeze and Engine Coolant
Thermostats
Grand Am GT
What does it mean when the coolant in overflow tank is boiling?
Wiki User
June 05, 2007 4:00PM
Engine is overheating. it could also just be that your radiator
cap is bad and allowing the pressure to release too soon. Keep an
eye on your temperature gage, if is showing hot or over heated then
check coolant level and possibly water pump problem or head gasket,
if not overly hot then suspect the radiator cap.
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