I don't have no heat! Change thermostat and.

Tiny
ANONYMOUS
  • 1999 GMC YUKON
  • 243,000 MILES

I don't have no heat! Change thermostat and heater core it blows cool air when on

Saturday, February 2nd, 2013 AT 8:24 PM

2 Replies

Tiny
MERLIN2021
  • EXPERT
  • 17,581 POSTS

Can be the heat control valve, if it has one, or the temperature blend door actuator on the plenum.

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Saturday, February 2nd, 2013 AT 8:29 PM
Tiny
MERLIN2021
  • EXPERT
  • 17,581 POSTS

Do both heater hoses get hot?

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Saturday, February 2nd, 2013 AT 8:29 PM

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