If it were me, I would at least oil up the bearings of the used one and then hook it to bat power before install.
..preferably with an amp meter in series .. looking for no more than 25A

if you do not have an amp meter , run it for a few min and see if it get hot.. if too hot, it is drawing high Amperage.. meter would be best..

Got it in this AM. Put some WD-40 on the bearings hoping it might penetrate. Works great, current draw is not excessive. Thanks to all who contributed.

FYI, I got the used blower assy. from Mike at:

EURASIAN FOREIGN AUTO PARTS
http://www.eur-asian.com
3244 So Platte River Drive
Englewood, CO. 80110
1-800-944-3215
303-922-8396

He tested it before he sent it out. The price was $10 less than any other quote I got and included the cost of shipping! $65 total. I had other quotes starting from $75 all the way up to over $100, without shipping. It took about a week to get here via DHL. I suppose they could ship it faster for a price but I didn't ask since I wasn't in a hurry.

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)