2004 Pontiac Sunfire Temperature gauge going up while idlin

2004 PONTIAC SUNFIRE
88,768 MILES • 4 CYL • FWD • AUTOMATIC
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BLU121778
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After driving for over 30 mins, when the car is on idle or when stopping and going (traffic) the temperature gauge starts going up. So far its gone up 3/4 and it hasn't touched the red mark. When I drive faster it goes down. I noticed today when it was going up, I turned on the A/C and it went back down to normal. So when the A/C is on it's ok. What could be the problem here?
Sep 12, 2008 at 8:10 PM
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RASMATAZ
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For a start check the radiator fan/thermostat/pressure cap and coolant level
Sep 13, 2008 at 6:55 AM