AFAIK, no fuse or switch in line with the block heater wiring. This doesn't guarantee that a PO added one . . .
You may have to crawl under and trace the cord from the plug to the block heater (passenger/right side of the block, just in front of the starter motor). It could have come unplugged, especially if it is NOT the factory cord, which has a screw-in retainer to keep the cord from coming unplugged. If the cord is in place and seems OK, then the block heater could have burned out (although that seems unlikely and I have never heard of one burning out).
Jeremy
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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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