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Adonblue

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Adonblue

Hi, I have a 2003 Honda civic Ex and it seems to lose coolant. It does not lose coolant externally, however, after putting dye in radiator...I discovered that the coolant is coming out of the reservoir. The car does not overheat and will throw a code after losing enough coolant P0128 which indicates a bad thermostat(not the case)! The thing is that coolant comes into the reservoir while driving but does not goes back in once the car cools down! I am suspecting a bad head gasket, or worse a cracked head which pushes coolant out pass the radiator cap into the reservoir!  Any thoughts on that anyone? Thank you!

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