Heat Trouble 2005 GMC Yukon XL Denali 6.0

Asked by Dec 10, 2017 at 11:18 PM

Question type: Maintenance & Repair

I drove my 2005 GMC Yukon XL Denali 6.0L for at
least fifteen minutes  tonight at highway speed
before I got any heat or defrost. I've recently
replaced the radiator and hoses, water pump and
thermostat, vent door actuator, and flushed the
heater core, and I've pressure tested the coolant
system.  The coolant level is good, the system
holds pressure, the engine temp is right where it
should be, and the heater core flows freely. Any
ideas of what is going on? Thanks.

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