Question about 2003 GMC Yukon Denali
'03 GMC Denali - rear heater generates only cold air when fan is on. Is it an operator problem or is there a specific switch that needs to be set or is there a machanical problem? The air conditioning works fine and can be set to a specific temperature -- but not the heater. There is only cold air coming from the vents.
Does front air work properly? for heat i mean?.. the blend doors are suspect as well as the heater hoses to the rear core and its heater valve.. possibily the control head is to blame or?, but i cant tell from here
Posted on Jan 14, 2009
I thought I had same problem . . . . until you turn the overhead switch completely to the right which I believe actually trips it to heat mode. hope this helps. Then back to the left copletely for air.
Posted on May 22, 2009
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Posted on Jan 02, 2017
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