The AC in the front is blowing cold. The rear is only blowing hot/warm. I'm guessing it's the rear AC actuator.

Anyone replaced the actuator for this issue? It's the actuator inside the passenger side, rear compartment panel?

Welp, in case anyone was interested...after quite a bit of research I've found out that Chevrolet decided to utilize two different AC units in the 2013 model.

Most of them (Delco) have very easy access to the actuator. Just remove some trim/panels, and change it out by unscrewing two screws. But mine uses the alternate AC unit (Behr); which puts the actuator on the backside. It will require removing the unit, in order to get access.

A $16 part, is likely going to cost me quite a bit to get changed.