I don't know how similar your '91 is to my '87 but mid-way through the '87 model year Mercedes added an external 30 Amp strip fuse for the a/c blower. If they continued this, the fuse holder will be attached to the shock tower immediately in front of the fuse box on the left (driver's) side of the engine compartment. See here for pictures. If this fuse is blown, no blower.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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