Random hot air from rear overheads

[SmilingBob]

Really odd one here. Now that it is starting to get hot we are running the AC more, and the air in the back sometimes is HOT. I mean, like full throttle heater all the way up hot. And the AC is on coldest and blows very cold from the front. If you turn off the vehicle and wait a few seconds, restart the truck - cold air from the rear vents.

Any idea on what needs to be fixed? I thought it might be one of the blend door actuators, but it works sometimes just fine until it blows hot, and then a restart fixes. Thanks.

 

[NathanJax]

I thought it might be one of the blend door actuators, but it works sometimes just fine until it blows hot, and then a restart fixes. Thanks.

That's exactly why it's a blend door actuator

 

[SmilingBob]

Ok, thanks for the info. Any idea which one exactly would need to be replaced for the problem? It's a 2004 Yukon Denali, thanks.

 

[NathanJax]

Here's a big thread about it...

http://www.tahoeyukonforum.com/forum/showthread.php?t=15787

and this is the thread that shows pics for the rear (I think)

http://www.tahoeyukonforum.com/forum/showthread.php?t=12635