I AM OVERHEATING PUM THERMOSTAT AND FAN RELAY ALL OK ,WHAT AM I MISSING?

  • Tiny
  • ronjohnson1
  • 2005 GMC Sierra
  • 80,000 miles

I have a 2005 gmc sierra with a 4.8 vortex engine. It recently began to overheat.I checked the water pump but it gives no sign of failure, I replaced the thermostat and the fan relay but it still is running hot. What do I try next?

Sunday, September 23rd, 2012 AT 7:06 PM

1 Answer

  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Do you have coolant losses?
When does the overheating occurs?
Are the cooling fans working?

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Sunday, September 23rd, 2012 AT 7:16 PM

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