Hello fellow desert dweller,

OK, I was writing this before Daryl answered, but...

How apart is your car? You are going to find things will go a lot smoother if either the passenger inner or outer fender has been removed as the blower motor (which installs in the firewall cover) is inside the fender (sort of)

While your in there, your going to want to replace all the foam rubber seals on the air control doors. Unfortuately, you will find one door you can't get to unless you are willing to break apart the spot welded heater box.

You will also likely find a lot of surface rust as the factory did not paint the insides of the boxes at the factory. I found that Naval Jelly was very helpful.

You will also need 3M Strip Caulk to reattach the box and the firewall cover to the firewall.