I have had many 122s , 544s and a 210. They all had one thing in common, the blowers all sounded like they were trying to tear the car apart. I believe it has to do with worn shaft "bearings" which are just a saturn-like sphere rotating in a felt bushing all held in a pressed metal housing. Oiling only temporarilly soothed the beast.

I have discoved a permanent fix. The motor shaft is 7mm, the seats in the motor housing are 22mm. I bought (2) NACHI 627 ZZ C3 bearings (also the NSK part number) from Motion Industries (located all over the country) for $6.77 total.

The bearings are not just a good fit, they are a PERFECT FIT. (Although you will probably need to take 320 grade wet/dry and clean off offending light corrosion on the shaft).

The new sound is sweet, the rush of warm air is now the loudest sound. And I firmly belive that it now puts out more air flow as the bearings run smoother, letting the blower spin faster than ever.