Question about 1994 Pontiac Bonneville

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Overheating bubbleling in resevoir

Overheating bubbleling in overflow brown water

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  • dogwood32 May 11, 2010

    Sounds like a blown head gasket.When it is cold you can remove the radiator cap fill to aprox. 2 inches from the top start it with cap removed and watch for bubbles.As the motor warms up the bubbles will increase.Be careful as it mat start to erupt.Well hope this helps.



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Bubbling into the overflow may mean a head gasket is gone, it may also mean the radiator or thermostat is blocked. or there is a leak
Clean and flush radiator, check the radiator fins for corrosion
pressure test coolant system
(if this is ok then)
new thermostat
new coolant

Posted on May 10, 2010


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