...above-referenced "blower motor regulator", please?

My '91 420SEL has just developed the identical problem: I can hear the various valves working going from A/C to Econ, but no fan action on high, low or auto positions...

Fuse #5 (8A) is fine. Could it just be the switch itself?

Thanks in advance for all consideration!

Cheers!

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'91 420 SEL @ 199K, '92 SVX @ 181K, '93 SC400 @ 86K, '93 Kaw ZX-11 @ 30K, '87 F250 @ 181K , 2001 Valkyrie Interstate @ 6K, Y2K Honda NightHawk 250 with 1.5K, '88 420SEL I.@ 179K & the 2nd latest, an '88 420SEL II.@ 210K runnin' parts car, '85 F150 300/NP435