Question about 1996 Pontiac Sunfire

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1999 sunfire overheating

My 99 sunfire is overheating. it sounds like the fin is kicking on and I checked the coolant. the temp gets high but only when I am at high speeds, it cools down when I slow down. it doesnt get to the point of overheating but it runs a lot hotter than normal.

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  • Anonymous Feb 12, 2009

    My 2001 Pontiac Sunfires temperature is at its max. The heat was working in the car. The gage light comes on. My fluids are full my gas is full. Today my temp was normal then spiked as it did this my car began blowin cold air instead of heat. The traction off light came on and the gage light is still on. The temp then dropped the traction off light went out gage light is still on. What is going on. I had a new water pump put in. Fan is kicking on. Coolant is full....???

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Try changing the thermostat

Posted on Jan 09, 2009

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Overheading 99 deville


The fans don't kick in until around 225 degrees.

As for the overheating, Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Regarding the misfiring, have you changed your spark plug cables?

VERY IMPORTANT....only use AC Delco spark plugs and wires.

Spark plugs ....AC Delco part number 41950

Plug wires....AC Delco part number 748Q

Ignition problems are common if you use anything other than the above OEM parts.

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