When I began a restoration on a 73 vert 6 years ago, the ac blower "screeched" this horrible noise that sounded like ruined bearings necessitating the blower to be removed and replaced. I saw on other post that the chinese aftermarket blowers were terrible. I just knew there had to be another way. I reached under the dash driver's side to get a feel ( of what I did not want to do) and I noticed the bell housing had heat vents that surrounded the motor. I got a small tube and first tried injecting wd-40 directly into the motor by way of the air vent on the housing. The noise initially quieted, then started screeching again, I tried silicone spray and the same thing happened. Last ditch effort paid off, I took about 1/4 cup of F type ford transmission oil and pumped this directly into the housing with the fan on, it quieted immediately, in fact so quiet that at first I couldn't hear it, but very strong air, and the air coming out of the ac only smelled like transmission oil for a couple of days. That was 6 years ago and I use it everyday and it remains super strong and quiet! So, it's worth a try rather than pull the fan out, which I suspect is a tough job, and worry with sketchy replacement parts. jrs