1999 GMC Jimmy over heating

1999 GMC JIMMY
11,400 MILES • 6 CYL • 4WD • AUTOMATIC
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ANGELAPERSONETTE
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My truck is over heating.
When I start the truck the fan comes on and stays on. ( The coolant is full) The temp goes up fast. If I turn on the heat while driving the temp goes up more but when i just turn on the fan (cool outside air) It goes down. But can't never get temp under 210.

I have been using alot more gas for short distances. Not sure if the fan not going off is the cause of that.

If you could please help me know what I can do to get it fixed. not sure what it is .... Thank you
May 25, 2008 at 5:33 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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