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If you are adding the e-fan as an auxiliary to the engine-driven stock unit, the rad swich should be wired to turn the e-fan on to high speed. This is because that rad switch closes at about 95C, and since it's located at the "cool" side of the rad, things are real hot by the time it acts.
If you decide to go ahead, get a new rad switch grommet from Volvo. They are cheap, and since it's the only thing holding that switch in there against the coolant pressure, you want a nice, fresh OE item.
E-fans as a total substitute for the engine driven unit have their fans (ho!) and their detractors, but I believe one very knowledgeable poster (Dave Shannon, IIRC) here went back to the original after going through a lot of experimenting and trouble to get an e-fan in his 240.
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Bob (son's 81-244GL B21F-M46, dtr's 94-940 B230FD, my 83-244DL B23F-M46, 89-745(LT1 V8), 98-S90, 77MGB and four old motorcycles)
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