2011 GMC Yukon Blowing hot on one side/cold on the other

[gsr8981]

I have started up the vehicle after I had a bad battery. I tried the a/c and it blew hot on the driver's side and cold on the other immediately when I started the car. I cannot find the HVAC or heater fuse. I pulled all the other fuses which I thought were related to try to reset them. When I started the vehicle, the hot and cold sides switched. Now I am reading about a battery reset procedure. What is that procedure? Is there a specific fuse for the heater in the 2011 GMC Yukon Denali?

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

My first thought is that you have a blend door malfunction issue, but @swathdiver is much more familiar with blend door issues than I am, and he will chime in with his thoughts and perspectives.

 

[Fless]

Moved you here from the CARiD vendor section.

 

[gsr8981]

I tried disconnecting the battery for a couple of hours. I took off both battery terminals. I put them back on. I started the vehicle and the A/C did not work at all. I turned it back off. I pulled the same fuses again #70, 39, 48, and 55. After putting them back in and starting the car, the A/C on the same side as before (when I pulled the fuses) came on (Passenger side only). I could also tell that when I pulled both battery terminals off, not everything reset as my clock was still keeping accurate time.

 

[gsr8981]

This time I got it. I kept the battery disconnected for a couple of days until the car was drained of the stored energy. When I reconnected the battery the a/c worked perfectly. I only knew about it from reading all the posts in here. Thanks everyone.