I read other threads that there are no cabin filters GM trucks until the new 2000 body style.
HOWEVER, I have found these same filters for sale?

http://www.drivewire.com/vehicle/che...-cabin-filter/

A -very- knowledgeable additional source assured me I do have one AND there seems to be one for sale, soooo.....

I suppose I would like to change one, if I have one as my coil is freezing over.