Something is leaking into coolant reserve tank 99 Pontiac Grand Am has odor too
if the head gasket is bad then oil will be in your coolant
Wouldn't the oil be milky
well pull your oil dipstick out and see if there is a shiny film on it if there is your head gasket is bad
Is it like a pink milkshake? Then it's trans fluid and your trans cooler/radiator need replacing.
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