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head gasket concern

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29 Jul 2026 13:29 #265011 by pozdnyakov
head gasket concern was created by pozdnyakov
hey folks
i have a 2009 m13a. engine was replaced december last year due to head gasket leak - confirmed co2 color change test.
everything was great the past six months and then she started puking large volumes of coolant to the expansion tank.
did like 10-15 co2 tests and all negative - radiotor and expansion tank.
no over heating, replaced cap, replaced upper rad hose, lower looks fine, heater works fine, thermostat is original maybe a year old, no visible leaks, no coolant smell in engine bay and no oil in coolant. when bleeding no constant bubbles (sporadic ones but it was the same on the last engine so sensitivity of this test is questionable).
when expanding to the tank and followed by cooling it does manages to suck some fluid back and upper hose gets softish.
tired of going back and forth with the GPT, screw that - someone has any idea what else is going on?

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