Mechanics

GMC YUKON HEATER PROBLEM

1999 GMC Yukon • 243,000 miles

I don't have no heat! Change thermostat and heater core it blows cool air when on
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Guest
February 2, 2013.



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

Merlin2021
Feb 2, 2013.
Do both heater hoses get hot?

Merlin2021
Feb 2, 2013.