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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.
Why would a bad head gasket cause the coolant reservoir to fill up? I noticed my car was overheated today, so I pulled over. It only took maybe a minute (with the car off, hood open, and fan on) for the temperature gauge to start falling, so I figured that I probably hadn't done any major damage.