Volvo RWD 900 Forum
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SAVE 1993 940 fan switch temperature range 900
posted by Volvodad on Sat Jul 4 21:55 CST 2009
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last visit: Fri Nov 20 18:55 CST 2009[RELATED]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.
--
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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SAVE 1993 940 fan switch temperature range 900
posted by weather on Sat Jul 4 15:05 CST 2009
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last visit: Fri Nov 20 23:29 CST 2009[RELATED]the fan on 940 is controlled by ECU via (FI) coolant temp sensor. imo on a e-fan retrofit to 240, the easiest way to switch the fan is to get a compatible 940 ECU and add the lines to ECU plug pins 10 and 11.
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SAVE 1993 940 fan switch temperature range 900
posted by malloy1 on Sat Jul 4 18:48 CST 2009
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last visit: Fri Nov 20 13:17 CST 2009[RELATED]I did it on my other 240-> piece of cake. Just had to wire up the trigger ground wire (blue-black wire on the relay) through the radiator switch. Works great!
But that one had a screw in type radiator switch, and the radiator came with the right temperature switch.
Seems the stock 940 switch triggers too high to use for regular driving. Anybody have the right part number for a temperature range around 82/77?
Paul
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SAVE 1993 940 fan switch temperature range 900
posted by mcduck on Sat Jul 4 10:28 CST 2009
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last visit: Fri Nov 20 21:46 CST 2009[RELATED]The ones I've seen have been either 93 or 95 C; much to high for anything but an auxillary fan.
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