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Probably a the water pump. But first I'd try 3 things. 1...make sure you have enough water in it. 2. Bleed the air out of the cooling system. If you just installed a new thermostat, this is a good chance of being the problem. (I don't have my car anymore, but I believe if you follow one of the smaller black water hoses that goes into the top of the engine...and where that hose connects to the motor, you'll see a silver screw thingamagig that if you loosen the screw, it will allow some water to come out just like bleeding the brakes). Might have been right near the thermostat...I don't recall. Have the car running and loosen it. If you're lucky, you'll hear air come out before antifreeze (lucky because this then could have been the problem and it's an easy fix). Once the antifreeze starts to come out, tighten the screw back up. Wait a few seconds and do this again. Do this unitil no more air comes out. Follow all the water hoses, there might have been more than one of these "bleeders"...I don't recall. Lastly, try another thermostat. If these 3 things don't solve the problem, get a new water pump.

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โˆ™ 2006-01-11 04:44:26
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Q: What causes the heat in a 1991 3.1 Chevy lumina to only get hot when pressing the gas pedal a little to idle it up some and is only warm at idle Thanks Glen?
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