• Tiny
  • pawpaw49
  • 1996 GMC Truck
  • 6 CYL
  • 2WD
  • automatic
  • 130,000 miles

Heater doesnt work on my 1996 gmc sierra truck 1500 4.3 I have already replaced blender door accuator and still doesnt work when I turn heat on it blows heat a second then cold air

Wednesday, January 12th, 2011 AT 3:20 PM

1 Answer

  • Tiny
  • mmprince4000
  • Expert
  • 8,715 posts

At engine operating temp, quickly touch the two heater core hoses on firewall. If one is hot and one warm/cold, then heater core is blocked.

Was this
Wednesday, January 12th, 2011 AT 3:26 PM

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