[Figuarus]

vince,

I pulled the airbox apart, cleaned it, cleaned the core, replaced the blower motor, cleaned the plenum box, and made sure the two flaps both work. I can select between windshield defrost, and floor. The hot/cold flap works. The only issue here is not enough heat coming from the airbox. Don't get me wrong, It's relatively warm, just not warm enough. I get 50 degree air when the temp outside is about 40.

I have to run the truck for about 15 minutes to get the coolant warm, and then turn on the fan to get any effect out of the windshield defroster.