Did a search first but didn't find anything. I have an '87 with the V8. The control panel is stuck on the defrost and floor positions, doesn't matter where I move the position to, vent, defrost, A/C, it doesn't blow through the front vents, only the defrost & floor. Even the A/C blows cold in this stuck position. I pulled the panel out & can't find anything obvious broken or missing in the dash. What am I missing, what's going on? Thanks!