Easiest to do it is thru the passenger door (remember this was the way we did it, might not be the way in the Pete book
)
Up under the dash, under the glove box, is a big black "lump". Track down all the screws that hold it in place. After getting them all undone wrestle it out of place. You will end up with a few little pieces of plastic left over (that broke off) at the end but it will still fit back tight. Oh, and if you bleed easaly have some band aids handy. You will see the AC/Heat blower down tube (the blower is actualy outside near the right hand wiper) but you will see it come down. Look where it goes into a "box", under that box will be a flat looking tray, that is the drip pan. On the right front corner you can track down a 3/8 clear plastic tube that runs down to a hole right where the firewall joins the floor.
Tip :- If you don't wana spend an hour or so cleaning the inside of the cab find a way to blow down it not up. We tracked it down outside and blew up, was that ever a mistake :sad: :sad:
Hope this helps.