Help with few things on 77 NYB

Hey guys got a few things I’ve been putting off on my 77 NYB.
I need to get into the hvac, it smells like a nasty barn when I turn the air on, something has gotten in there. What’s the process so I can clean her out properly.
2nd one of the rear window motors won’t work. I can hear it make a small click when I hit the window down, but no movement. I have taken the panels off before. How hard is the window motor to access?
Thank you and happy 4th!

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Author: 77NyKR