Rear Climate Control

After installing an aftermarket stereo in my 2003 Montana (with stock rear Dvd system) I have lost all control of the rear climate controls. Has anyone ever found a work around to regain control of this function?

Removed aftermarket stereo and installed the original factory radio. The rear climate control still says disabled even after the switch is set to "R". Could I have shorted something out? Oh and by the the way, I cant get any heat from the rear blower. It only blows cold.

I'd say check all wiring around your installation and removal, pinched wires, unplugged or loose connections, screw(s) run through wiring, fuses. Check everywhere that you were when you installed the system.