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Car Over Heating

Eli9's Avatar
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11-04-02, 01:57 PM   #1  
Car Over Heating

I have a 95 Grand Am which is over heating.

It is an automatic and has a V-6 engine and I have changed the thermostat, but it is still over heating.

It starts out fine and when you put on the heater cold air comes out and it starts over heating. If you then excelerate and it goes to at least 2.5 rpms warm air starts coming out of the heater and the tempature goes down very fast, but within a couple of minutes the warm air stops and cold air starts and it starts over heating again.

Any ideas????

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davidf's Avatar
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11-04-02, 04:09 PM   #2  
Water pump is probably at fault.When you increase RPM the water pump turns faster and pumps the water to the heater rad and you get heat but because it is faulty like broken impeller fins or whatever, it only can pump the water only so much before it can't pump more .Only initial pumping of a number of quarts is ok.

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