I have a 1998 blazer with the computer climate control.I have no heat, i have narrowed my problem down to the electricacuator motor for the blend door.only time acuator moves is when you first turn ignition on it will turn all the way right(open door) then all the way left (close door) then thats it it will not move no more unless you turn ignition off then back on.any help would be appreciated thanks

 

I had that happen on my 1996 Pontiac Bonneville. The part was only 80 bucks, but it was 400 to have the dash torn apart to get to it. I didn't do it because the actuator door was right behind the air bag in the pontiac.
Maybe you can get to yours from the glovebox. Good Luck.