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It is the job of the Head Gasket to make sure that none of these respective parties: Engine Oil/âSharksâ, Coolant/âJetsâ, and air, fuel and exhaust/ârest of the partyâ ever mix with each other. When the head gasket leaks or fails â then one or more of these elements can mix â which leads to a myriad of issues. Here are a few examples: Low combustion pressure â poor performance. Exhaust gets into the coolant â leads to overheating. Coolant gets into the oil â poor lubrication and possible engine damage.
Re: coolant was boiling in overflow tank. that's the excess coolant getting pushed out of the radiator as it expands when it gets hot-it bubbles because it boils when it leaves the 15psi radiator and hits the atmospheric pressure in the coolant tank... don't worry about it unless the car overheats and/or loses coolant.lassifieds Rating: (0). Re: coolant was boiling in overflow tank. You could just replace both, as they aren't very expensive. To check your thermostat, you can take it out, put it in a pot filled with water on the stove, put in a temp gauge, and watch it open at the correct temp.