Yes it's a big job and a royal pain also . When I remove the old HVAC unit I will take another video. I have three more cars to do after this one two are forum members .
I'm one of them

Nice to see you will have a few of these under your belt for practice before I get in there. You'll have it down to a science!
Fiscali: You will know you have this problem if, as soon as you open the car door, you hear a whining noise coming from inside the dash (before the car is even turned on). I notice it sometimes when I open the passenger door too.
The other "symptom" of the problem is that it fogs the bottom center of the windshield. In the summer here it can get pretty bad - even dangerous - which is the main reason to do the fix. Other than the fogging, the problem is pretty benign (the noise is a slight annoyance, and the A/C still works, which is why I left it a year).
The problem seems to be worse when it's hot out, or when I have the car parked in the sun (which is almost always) - not really sure why this is.
I'm looking forward to fixing what has been the one and only real problem with
#328 .