Passaenger side blows only hot air

[Hoffa]

Passenger side blows hot air only. I know i need to change an actuator but i dont know witch one. Can some one help me please. On a 2003 GMC 2500HD. with the auto climate control.

[hiking_mike]

I believe in the middle under the heater box, had same problem. Nit to difficult to change. Got a new one, Dorman was the MFR, from a Advance Auto parts. Was about $65.00.

The

We also had to change the diverter one, truck was stuck on defrost.

The left is directly under the heater box by the blower motor.

.. Looking at All Data.. but cant post pics.

[hiking_mike]

You will have to do the " Re-Calibrating Actuators"

1. Pull fuse for HVAC

I cant find the exact steps but should be on the web.