My Heating A/c messed up on me yesterday. When I turned the temp. **** it stayed hot air. so i took off the bottom a/c cover and there is a little motor that turns a shaft that opens and closes ,I guess , something to switch from hot to cold, well the shaft is stuck because the motor turns after I took it off the shaft, I cant even get the shaft to move with brute force. I think something has it jammed in there. Anyone had this happen before? How hard is it to get to that sucker, looks like the whole dash has to come off.