2005 Kia Optima Engine running hot

2005 KIA OPTIMA
31,070 MILES • 4 CYL • 2WD • AUTOMATIC
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MSMARY1942
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Will stopped at light notice temperature gauge in hot zone (red). A/c was on so I turned it off when I started to drive again the temperature dropped back down. I turned a/c on again and the temperature started to rise again. what is happening?
Aug 5, 2008 at 6:11 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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