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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 06-08-2005, 08:15 AM   #1 (permalink)
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Has anyone here upgraded their radiator fan switch from the 91 degree to the 82 degree? I was wondering if it was really worth it and if it would be necessary.

Currently my low fan switch does not work and I am planning on autocrossing my car this summer=possible overheating. Should I just go with the stock 91 degree or the lower temp?

Also, should I keep my 99 degree or get a lower temp for that too?
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Old 06-08-2005, 08:19 PM   #2 (permalink)
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Dude, I love the catchphrase. 5000rpms of fury. As a fellow E owner, I agree.

Am I the only one confused about the fan, however? My E has a fan bolted to the front of the engine, and it spins with the engine. Don't have any other fans on there. I don't think it's electrically actuated.
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Old 06-09-2005, 10:21 AM   #3 (permalink)
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Quote:
Originally posted by offabroadway@Jun 8 2005, 09:19 PM
Dude, I love the catchphrase. 5000rpms of fury. As a fellow E owner, I agree.

Am I the only one confused about the fan, however? My E has a fan bolted to the front of the engine, and it spins with the engine. Don't have any other fans on there. I don't think it's electrically actuated.
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There is also an electric fan in front of your radiator that will turn on low when your coolant level reaches 91F and then high at 99F. I was wondering if I should get a temp. switch that will turn the low on at 82F.
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Old 06-09-2005, 10:36 AM   #4 (permalink)
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Ah.

Well, if your aim is autocross, why not? Could only help.
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Old 06-09-2005, 09:06 PM   #5 (permalink)
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The only problem with using the lower temperature is that the fan will most likely be on which will be using the alternator more and thus taking away from the power getting to the wheels. I'm still undecided though.
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