2004 GMC Sierra Door Blend Actuator Help

[Jantrl]

My AC only blows cold on the driver's side. The passenger kicks out some heat. Here's where I am so far:

 

I noticed no movement from the passenger side actuator. I recalibrated the system, no improvement.

 

Went ahead and replaced the passenger side door blend actuator. That was not fun to say the least. Did it by removing the passenger side airbag, vent and dropped the glovebox.

 

That didn't fix it. I noticed however that the white dial went from the center position to the right. It seems to be stuck there no matter what I do with the climate control dial. I recalibrated the system again and nothing.

 

I'm at a loss with what to do next. Could the terminal cable be bad? I'm not sure where those wires lead. Any guidance is appreciated. 

 

I bought the new actuator from Oreilly. They had a 65 dollar one and a 140 dollar version, both from Dorman. The salesman could not tell any difference between the two, so I opted for the 65 dollar one. The terminal connection was exactly the same on both. A mystery to me. I hope to god that one is correct and the other isn't.

 

One more thing to note...When I bought the truck used, the air blew cold on both sides (Florida purchase). When I got it up to Atlanta, there was not heat. I took it to a mechanic who discovered the heater core was disconnected (bypassed). We went ahead and connected it to see if it leaked. No leaks. So we just hooked it back up. Heat worked great. The passenger AC, as noted, stopped working. Perhaps there's a connection there.

 

The truck has 80k miles and is a V6.

 

Thank you.