• Tiny
  • touchngoes
  • 2005 GMC Sierra
  • V8
  • 2WD
  • automatic

2005 GMC Serria 1500: Interior heating not working on any setting, defoster not working too. Flucuating water temp indicator jumping from normal to 30 degrees higher then back down to normal. Electric raditor fan is working.

Wednesday, December 22nd, 2010 AT 6:41 PM

1 Answer

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

Have you replaced the thermostat? Is the coolant full? As far as the heater, with the engine running, hot, and the heater on high, do both heater core hoses get hot?

One last question, is the blower motor working for the heater or is that the issue?

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Saturday, January 1st, 2011 AT 9:12 PM

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