2001 Suburban Heat/Ac

[SpareParts]

My Suburban has rear heat/ac. The front works fine but the rear however does not.
If i turn the rear on it will only blow cold air unless i turn it all the way to hot then it blows hot.
It will not self adjust like the front.
If i turn the rear on full auto it will only blow on high speed cold.
Any idea where to start looking for the possible problem?
It is relatively new to me so maybe i dont fully understand how it works.

 

[SpareParts]

Reading the forum i discovered a reset fix. Gonna give that a try Friday.

 

[Tonyrodz]

Reading the forum i discovered a reset fix. Gonna give that a try Friday.

What did you find? Does the reset cover all of the NBS?

 

[SpareParts]

Many threads about it.

Recalibrating HVAC

I don't remember where I learned this but this has helped me and a few others when either the A/C or heat acts up, usually after either replacing the battery, an actuator, or HVAC control head. First, start the engine and turn all the controls to the off position, (rear controls too if they're...

www.tahoeyukonforum.com

 

[SpareParts]

My HVAC was working fine when i first got the truck. I don't remember why but i had the battery unhooked for for a little bit one day a week or two ago.
I did not know about turning off everything HVAC related off, So it was set where it was when i unhooked the battery.
A few days ago i noticed the system was not working right. Defrost button works fine but the other 3 flash 3 times then go out also.
Hoping it's all just outta sink and a reset fixes it.