Question about 1995 Pontiac Firebird

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Coolant doesn't circulate in raditor. Also coolant blows back through raditor.

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Hi,
3 options.
1, The water pump has failed. Take off a bypass return hose, high in the engine, and when starting up you get a coolant surge, then it is ok.
2. The thermostat a failed in the closed position.
3. The Coolant core tubes are plugged up, restricting the coolant flow. As the engine coolant expands with heat, it back pressures from the radiator cap, or through the surge tank.This is a common problem in a High water Calcium, or Phosphates area, when the Anti freeze mix is Weak, or Tap water only is used.
Regards, DT

Posted on Apr 10, 2011

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The coolant is probably not circulating because either the water pump impellers are worn or broken off of the shaft,the rad maybe plugged or possibly the thermostat has seized closed causing a restriction in the system.the coolant blows back because its not circulating and over heating and will escape were it can.

Posted on Apr 10, 2011

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