Radiator fan

PONTIAC GRAND PRIX
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GRANDPRIX96
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  • 1 POST
I have a 96 Pontiac Grand Prix SE w/150,000 miles. I just had the radiator flushed and noticed that the temperature gauge fluctuates when I drive. The temp goes up when I'm stopped but when I start driving it goes back down. It's never overheated, but gets to about 210 or a little above.
Someone told me the fan should kick in when it gets to a certain temp. Is that true? Any other suggestions.
Apr 3, 2007 at 2:30 AM
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LILWILLS
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  • 49 POSTS
yeah have the fan tested
Apr 3, 2007 at 11:41 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Try the temperature switch/fan relay and the Stat.
Apr 3, 2007 at 1:23 PM
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MCFERRANCE
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  • 100 POSTS
This may be acting normal and now that the flush has cleaned the sensor, the sensor is more sensitive in controlling the guage.
Apr 6, 2007 at 8:11 AM
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MCFERRANCE
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  • 100 POSTS
To clarify this more:

The thermostat doesn't open until the temperature reaches about 200-210 degrees with a properly working radiator pressure cap. Once it does open, cooler coolant enters into the engine thus making the guage drop typically about 10-30 degrees depending on the outside air temperature.
This is why I say it may be working correctly.
If I watch my own guage closely, I can tell when the thermostat opens and closes.
Apr 6, 2007 at 9:16 AM
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