Take off the cover under the dash on the passenger side- blower is behind it. Disconnect the wires, pull the blower and clean it. Lube with a few drops of ATF, clean the wiring connectors and the plug and put it back together. Should give years of further service.

If that is what is wrong with AC you are way ahead.

__________________
95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k