Chris,
You should replace the thermostat, as it also functions as a water
restrictor (someone mentioned that) I recommend you find a shop that has a
cooling system pressure tester, and have the test performed: it resembles a
bicycle pump that replaces your radiator cap, and has a pressure gauge. If
there is a headgasket leaking or a cracked block or head, the pressure will
fall. If you remove the spark plugs, you may be able to hear a leak
especially if you use a length of hose as a stethoscope.
Jim Leach, Seattle
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