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Sounds like your W126 wasn't upgraded to the strip fuse. Mine wasn't either.
My fan does exactly what you are talking about. It spins easily, but doesn't freewheel. Until I get a new blower motor, I've rigged some 10 gauge and a 30amp switch. Even with the massive wire and the 30 amp switch and 30 amp fuse, its still getting too hot to touch at the switch and the fuse. Tells me there is too much resistance.
It may be possible to refresh the fan with fine sandpaper and new brushes, but new motors are less than $100. So I'll just put a new motor in. I just hope the squirrel cage doesn't snap while I'm swapping the motors.
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had) 
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head 
99 Suzuki Intruder "Trudy" @ 45 mpg
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