1999 GMC Jimmy over heating

1999 GMC JIMMY
11,400 MILES • 6 CYL • 4WD • AUTOMATIC
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ANGELAPERSONETTE
  • MEMBER
  • 1 POST
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
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Hi there,

Start with replacing the thermostat & get the radiator flushed & flow checked, start here.

Mark (mhpautos)
May 25, 2008 at 5:43 PM
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