Replacing Blower for Dash AC

[Chaplain Kent]

I gave up on the Gen Set, anyone who wants to chime in on that the thread is under "mechanical stuff." So now I switched over to the blower for the dash AC. First off the fuse was blown. I replaced that. Next the blower for the heater works fine but the blower for the AC makes a terrible noise like it is rubbing on something, most likly a bad bearing. There is no low speed. I got down as close as I could to the assembly and it appears there are two separate blowers one for the heater and one for the AC. The diagram in my service manual does not look anything like what is under my dash! It appears to me that the AC fan is behind the heater fan and this is where the noise is coming from. I also have separate switches and vents for these two fans. OK, who has this set up and who has replaced it? Are there parts available since I am almost certain I will need to replace the blower for the AC? Can this job be done without removing the dash and or heater core? I live in Wisconsin where it is not supposed to be hot; why is it hot and why do I need the AC?