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1999 Pontiac Grand Am Engine overheating while heater is on

Tiny
BOSSMAN325
  • MEMBER
  • 1999 PONTIAC GRAND AM
Engine Cooling problem
1999 Pontiac Grand Am 6 cyl Automatic 130000 miles

I have a 1999 Grand Am. We have had a problem with the heater and with the car overheating. When we first got the car, we would turn on the heat and it would be fine and then when we clicked it over to AC the air coming out was actually hotter than when it was on the heater. Then the car started to overheat. The car would run normal and the heater and AC would work fine. Then when we would turn it on the heater, it would start out hot and then go cold and then the car would overheat. We replaced the thermostat twice, the radiator, the water pump, the belts and have had it checked all over for blown gaskets and for cracks in the heads and block. Recently we were driving it with the AC on and the car will not overheat, but as soon as I turn it to the heater it overheats like crazy and the coolant comes flowing out of the overflow tank. Any suggestions?
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Monday, February 23rd, 2009 AT 12:08 PM

1 Reply

Tiny
BOSSMAN325
  • MEMBER
  • 3 POSTS
Also, the power steering pump feels like it is going out. The fluid is full and the steering feels fine when you first start the car, but as you start to drive it and the car starts to warm up, the power steering gets really tight and hard to turn, especially when you are stopped. Could this be related to why it might be overheating?
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Monday, February 23rd, 2009 AT 12:11 PM

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