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Aux Fan Switches/Aux fan resistor (archive)

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Posted by ron on February 24, 2000 at 10:59:15:

I was just looking thru the latest BMP catalog, and noticed they have replacement (lower temp) aux fan switches that are rated at 82c instead of the factory 91c. Supposedly this allows the aux fan to kick on earlier than the "slightly over midpoint" mark. My aux fan kicks on at midpoint, and i have no cooling problems--i replaced the water pump, thermostat, hoses, etc. but sometimes in traffic the needle still manages to creep a needle width over the mid mark, never any higher. I've just written it off as it might be time to finally replace my radiator, but i'm wondering if one of these $23 switches might be worth a try. Also, if my fan DOES come on, is it likely there's anything wrong with the aux fan resistor? How do you test if you actually have 2 speeds, lo and hi? TIA

ron 89 525i


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