1990 Chevrolet 2500 Pickup Q&A

1990 Chevrolet 2500 Pickup Question: defrost doesn't work

some linkage came off and I have it but don't know exactly where it goes to enable the defrost to work. -
Answer 1
can you see the linkage ? chevy had problem with that door that directs the air to the windshield and i have seen a few that stick there is a motor that controls that door. -
Answer 2
Lots of times blend door problems cause the linkage to pop off, may have to do some disassembly-like replacing heater core-to get far enough to see problem. Need to verify door movement to allow linkage to not bind. -
Related Items:
heater blower works but defrost doesn't,speed control is working