No rear heat

[the blur]

my 03 Denali..
No rear heat. front heat works fine.
any clues ??
or yet another trip to the dealer ???

thx

[Eggert]

Hi blur, this stuff is on the rear passenger wheel well. You may want to take the interior trim pieces off and check things out. Do the heater hoses running under the passenger side of the cabin get hot? You can see them from the outside. Does the electronic heater control work right? Do you have enough antifreeze or an air pocket?
Because everything is electronic you may want to visit the dealer.
Take care, Eggert

[rzkz8k]

Originally Posted by the blur

my 03 Denali..
No rear heat. front heat works fine.
any clues ??
or yet another trip to the dealer ???

thx

I had this issue on both my 03 and 04 YXL, if I had the rear HVAC system off when I started the engine and then turned in on (after warm up), then I would not get rear heat, just cold air blowing.

If I pulled over, turned off the engine and wait about 30 seconds for the computers to go to sleep, then turned on the rear HVAC and started the engine I would get heat.

Dealer was working with GM Tech to find a fix which they have yet to do.