Quote:
Originally Posted by 100%Chevy
Also,I suggest you remove and clean the evaporator and the box it's in.These trucks are bad about leaves,trash,rats nests etc.filling this full and blocking the air flow.And,prevents the temp door from moving.
Mike. 
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Any instructionals on how to do this? I googled and didn't find anything for 81-87 (lots of them for GMT400)
My temp selector won't go all the way to cold. I have a feeling what you describe is the problem.