Thanks so much for the quick reply. I'm assuming then that my problem is only the main heater core in the dash. My wife drove the truck tonight and tried to use the defroster, but the windshield fogged up bad enough that it was difficult to see out the windshield.
I guess I know now how I'm spending my weekend. I wonder what the chances are the dealer will have that blend door in stock? I did a quick search on here and noticed it seems to be a very common problem with these trucks. I would rather replace it before it breaks rather than have to pull the whole dash a second time. The truck does have 90k on it.
One other quick question if you don't mind, my chilton's manual says the A.C. lines need to be disconnected before the heater lines can be accessed to remove them from the core. I did take a quick look under the hood only to realize I can't even see the firewall or where the connections are. I forsee some blood shed on this project.
