Cavalier running hot

Tiny
CAROFF1
  • MEMBER
  • 1997 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
I have a 1997 Cavalier 4 cyl. With 170,000 miles. The car runs hot ( almost overheating) at highway speeds while maintaining good interior heat. At speeds below 30 the heater sometimes blows cold air. If the car starts to overheat, I can shut the blower fan off or on low and it usually starts to cool off. The only coolant that I can find leaking is from the reservoir cap (the car does not have a radiator cap) when it starts to overheat. The water pump and thermostat were both replaced about 35,000 miles ago. I'm adding about 3-4 cups of coolant after a 70 mile round trip. I'm at a loss, please help.
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Wednesday, December 15th, 2010 AT 3:05 PM

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Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
You will have to get a cooling system pressure test done and I would be considering having the radiator cleaned as it may have some blocked core tubes, a back flush will not clear this it should be done by a radiator repairer.

Mark (mhpautos)
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Friday, December 17th, 2010 AT 1:10 PM

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