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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Posted on Jan 02, 2017

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Pushing anti-freeze out the resevoir. Changed water pump, thermostat. Temp. gauge does not indicate overheating. Fans seem to be working OK.


Try replacing the radiator cap. A weak cap will allow coolant to leave the radiator and go thru the overflow tube to the reservoir.

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My 1995 subaru legacy is overheating and there is no heat.there is extra coolent in the overflow resevoir.....


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We have replaced the overflow resevoir 3 times in 3 mouths, we just replaced it this week, and now tthe engine is overheating at stop signs, and is runnig in the red range, what is going on, and how can we...


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Overflow in car is bubbleing after i shut it off.


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Antifreeze overflow


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