First, I want to thank all of you for this forum and the knowledge I have gained reading it. I recently purchased a 91 K5 in good shape and am trying to sort some of the small problems out. Thats the fun part right? I am not new to 4WD although my experience has been with jeeps. I mostly use these vehicles to drive the Outer Banks of NC. Two questions. How is the quality of LMC seals for the back glass? Would I be better off going to the Dealer? Second, I am having problems with my heater. After the truck warms up I will get an occasional whisp of smoke from the vent above the heat/ac control, only when the heat is on. I have dismantled the dash in this area and cannot see any burnt wires. Any ideas? On this model where is the blower motor, inside the cab or under the hood? Thanks.