I've got a 99 rodeo, and the climate control suddenly stopped turning past the straight up vertical position on the heat/cold dial. No matter how much or hard I turn it, it will not go beyond that position (which blows out heat if I turn it on). Has anybody had any experience with this? Coupled with the fact that my aftermarket radio works sporadically, I'm beginning to think that I have gremlins at work behind my dash.

Probably jammed the door that decided what temp to blow out. Not uncommon. Ours dont have valves, the coolant flow through all the time and it just uses doors to direct the air.

Thanks Gizmo,

Any thought on how to "unstick" the door?

Got it fixed. I took the radio out and saw that one of my crossovers was jamming the latch.