I DONT 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 Answers

  • Tiny
  • merlin2021
  • Expert
  • 17,583 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
  • 17,583 posts

Do both heater hoses get hot?

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

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