I have a 2007 1500 Suburban LTZ, with auto dual zone climate. The driver side gets hot air, while passenger side gets cold or hot, depending on where you want it.

I am pretty sure the part is called a "Vent door Actuator" that needs to be replaced. My problem is I don't know for sure where this is located. Can someone tell me where it can be found?

Thanks,
Ronnie