1999 GMC Yukon Repair Question
Topics covered: Heater, Blend door, Blend door actuator.
Mileage: 243,000 miles.
Mileage: 243,000 miles.
Asked on February 2, 2013
GMC Yukon Heater Problem
I don't have no heat! Change thermostat and heater core it blows cool air when on
Asked by (pending member)Answer
Replied on February 2, 2013
Can be the heat control valve, if it has one, or the temperature blend door actuator on the plenum.
Replied on February 2, 2013
Do both heater hoses get hot?