Gawlbpd,
Sixto has it right on the money. I just took mine off last week to clean it out. Only additional suggestion would be to have a small mirror handy, because the screws in the back are tucked way up in there. Are you sure it's the blower motor that's bad? I had the same problem last summer, with a $1000 estimate, and I got a second opinion from an MB indy. He said my problem may have had nothing to do with the blower fan, but that it was actually an ignition switch rear assembly problem, something I could fix myself for less than $100. He said lots of unscrupulous mechanics, at both indies and dealerships, will charge $1000 for the new rear ignition assembly, and since the AC then works fine, and the front of the ignition switch remains the same ( the original ignition key works fine) no one is the wiser. I did what he said, because I always start with the least expensive fix first, took out the old assembly, (the original ignition switch was 20 years old), compared the new rear switch assembly to the old one, and immediately saw what the problem was. Just like he had said! One of the pins on the back of the old switch was too worn to make contact. Now, both the AC and the car run fine, and I saved about $900!
Steve Kaa
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1982 300SD 313k miles