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2008 Pontiac Grand Prix Base 4dr Sedan

2008 Pontiac Grand Prix
Trim Info:
Front Wheel Drive, 4 Door Sedan, Mid-Size
18 mpg city / 28 mpg hwy
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April 29, 2012, 5:23 pm

AutomotiveForums M

Question: What is the normal temperature range of an '02 Grand Prix (non-supercharged)?

What is the normal temperature range of an '02 Grand Prix (non-supercharged)

I just replaced both intake gaskets on my '02 Grand Prix GT (non-supercharged, 114,000 miles). In the process I also replaced both the thermostat and the temperature switch - not that they were bad, but I had easy access to them and wanted to take advantage of it.

Now, however, running on cruise control at 55 mph when 60 degrees Fahrenheit outside, the Grand Prix will level off at about 220-230 degrees Fahrenheit. Though I can't give you a "before" temperature because I just bought the car, I don't like this for four reasons:

1) I drove a 2000 Grand Prix GT (also non-supercharged) for two years before I bought this one. The temperature gauge on the '00 model almost never exceeded 185 degrees Fahrenheit.

2) Revving the engine to 3500 RPM for 10-15 seconds raises the temperature to the beginning of the red mark. The cooling fans kick on and bring it back down a bit, but I don't like the idea of the temperature getting anywhere close to where they could damage the engine.

3) A small amount of smoke comes from the oil dipstick after the car is revved to 3500 RPM as described. There is also a burning smell. (Or could this be from coolant getting in the oil as per the recent intake gasket change?)

4) The upper radiator hose is too hot to continuously touch at 230 degrees - is this normal?


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