Question about 1996 Chevrolet Cavalier

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Just replaced the water pump (brand new) and thermostat (brand new)on my daughters 1999 cavalier. Belt was placed back on correctly. Car is still overheating. It seems like the pump is pumping water/coolant the wrong way....I cant figure this out?

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  • mom236kim Mar 12, 2009

    We took it back yesterday and got a new one. It looks exactly the same as the old one and the 1st one we bought. When I try to bleed the air out of the system it gets REAL hot....the temp. gauge steady climbs closer and closer to the orange line so I just shut the car off cause Im scared I may cause damage to it by letting it run hot. I have been told that there is air trapped in the system. How long does it take to get the air out...I have tried several times and it just keeps running hot. How should I go about bleeding the air out? I just feel like Im doing something wrong. It also seems like one of the hoses is cool when the rest of them gets hot.

  • mom236kim Mar 12, 2009

    I changed the water pump because car started overheating and there was coolant leaking from the bottom weep hole. The radiator itself was cold and the bottom radiator hose. And no coolant flow on top radiator hose. On this car which way does the coolant flow into the radiator... bottom hose or top hose..thermostat is in bottom hose.

  • mom236kim Mar 16, 2009

    The radiator is not clogged and we bled it the correct way. The thermostat is in correctly because there is something in one of the hoses where you can only place the thermostat in one way, it wont go in the other way. The temperature seems to be ok while you are driving but when u sit idle it just gets warmer and warmer....and still when you touch the radiator it never gets warm. I just don't understand. Also, in this car the thermostat is located on the bottom radiator hose.

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You've probably replaced it with the wrong pump. The pump can look the same but if you remove it again and look closely you'll see that it spins in the opposite direction. Take it back to the parts store and tell them to try again.

Posted on Mar 12, 2009

  • carfixing Mar 12, 2009

    Which hose is cold? Sounds like a circulation problem. Could be a radiator problem. What made you change the water pump in the first place, just the overheating and you guessed it was the water pump?

  • carfixing Mar 12, 2009

    Are you sure you put the thermostat in, in the right direction? Sounds like it might be backwards. If it's backwards it would take forever for it to open and heat up the radiator. Also how did you bleed it exactly? you should have loosened the bleeder nipple and poured antifreeze in the radiator and the antifreeze should drip right out of the nipple with a good stream. Don't forget, the radiator could be clogged. The best solution is to take out the thermostat and see if it still overheats. If it does, the radiator is probably clogged.

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