defrost doesn't work on 1990 Chevrolet 2500 Pickup

some linkage came off and I have it but don't know exactly where it goes to enable the defrost to work.

by in Rexburg, ID on February 22, 2011
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2 answers
ANSWER by , February 22, 2011
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 by , February 22, 2011
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.