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Re: Coolant question
"""I've brought the coolant level down to the fill line once, only to have it come right back up to the top again without going down."""
If the system is working properly, even with "overfill"
when the engine gets to operating temperature, and overfills the reservoir, the cooling action, when the engine is turned off and cooling, will suck some of the coolant back into the radiator.
Chances are... there is a head gasket problem or something as simple as a radiator cap.
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