2002 GMC C1500 engine overheating while going up hills

2002 GMC C1500
130,000 MILES • V8 • 4WD • AUTOMATIC
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MAGNUM51
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  • 1 POST
I was wondering my truck gets very hot when pulling hills only with or without a trailer. I notice the secondary fan does not always click on when it gets above half. I have checked the coolant and replaced the thermostate but it still is doing it. Not sure what to do?
Mar 14, 2010 at 3:20 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Have you checked the fan that isn't working by running power directly to it? Also, have you had the radiator flushed?
Jun 5, 2010 at 8:54 PM
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