Oh, It would just be easier to get an aux fan from the junkyard, ready to R&R into your car. Does your 240 have a working A/C?

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002