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On some Mercedes fan clutches , there is a flat metal tab that can be bent to fit in a slot which makes the fan operate all the time. I believe it was on the engine side of the fan on the one I looked at. The instructions in the owners manual, stated that once it was bent and the clutch mechanism overcome, the vehicle should not be driven for more than 600miles before repairing the fan clutch. I don't see why it couldn't be driven forever in that condition.
I think (I'm not certain) that I read of this procedure in the manual for my 409d van. I don't know if a similar tab exists in the car model diesels.
The bolt on flex fans are more than $20. More like 60-70.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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