Mechanics

BOILING OVERFLOW

1995 Chevrolet Monte Carlo • 112,000 miles

I have a 1995 monte carlo and the anti-freeze in the overflow is boiling, but there are no leaks from water pump or thermostat, or the radiator. What causes that problem?
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How long has it been overheating? It may need a thermostat, may have clogged radiator or a blown head gasket from driving overheated.

Roy