2004 Yukon Xl Rear Heat Cold

[benculv]

First hello everyone this is my first post to this forum.

 

I have a 2004 Yukon xl and the rear heat is blowing only cold air. I cannot control the air temp from the front or rear controls. I have researched this problem and I think it may be the blend door actuator. I found a repair procedure on this but I have a few questions that I hope someone can help me with.

1. The procedure states that the rear actuator is located behind the "right rear quarter trim panel". Where is this panel actually located?

2. The last step in the procedure states "calibrate the HVAC module actuators, if required". How do I calibrate this actuator?

I also read on this forum that I may be able to fix this by doing a recal. I read the procedure on how to do this but there was a statement to make sure that the correct fuses for my vehicle are pulled. I do not know which fuses I need to pull for my vehicle. I am also not sure if I can do a recal on the rear heat only. I do not want to take a chance and mess up the front controls since this is the only heat I have at this time.

Thanks for any help I can get.

[jackyshaikh]

If you don't wants to take a chance,then you need tech2 to recalibrate the actuators.sometimes this trick does't work if there is DTC's in HVAC module.