Blend door problem
 

Got a 08/250/64k/6.4/duel heat air.I think the driver side blend door won't operate. Passenger side goes from hot to cold,driver stays on ac.
#1 can you manual move door
#2 is it vac. or elec.
#3 any place i can get diagram or drawing of heat assy.
or how to get to it
Thanks for any help

Do you have a vacuum problem?

Don't think so. Pass. side door works,4 wheel works,pump runs and stop correct.

If vac verifies with a gauge.

Then, start looking for a break in the hose, a bad actuator, or...

Have you consider the possibility someone threw crud into the "hole" and jammed it?

When I cleaned out my vents, I found, pens, pencils, and misc. garbage throughout the ducting.