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January 10th, 2012, 01:30 AM   #1
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thermo switch - fan kit.

2010 fs570
i commute in 35 degree plus heat (peak hour traffic), so i fitted the fan kit, that thermo switch kicks in way too late i reckon. does anyone know if there is a switch available with a lower threshold temperature?
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January 10th, 2012, 05:50 AM   #2
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Re: thermo switch - fan kit.

There sure is, and for much less than KTM charges. The 'accessory fan switch' for the '04 BMW 318i is interchangeable with the KTM sensor and is available in several different heat ranges. I prefer the 95/90 C unit. You can pick one up or order one through your local auto parts store. Note that the current stock KTM sensor is rated at 100/95 C while earlier KTM sensors were rated at a too low 85 C.
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January 11th, 2012, 03:38 AM   #3
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Re: thermo switch - fan kit.

thank you.

so i just need to ask for a bmw 04' 318 thermo switch?

from which part of the car?
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January 11th, 2012, 05:29 AM   #4
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Re: thermo switch - fan kit.

As mentioned, it is the Accessory Fan Switch for the cooling system.
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January 11th, 2012, 07:25 AM   #5
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Re: thermo switch - fan kit.

Here's the part from Napa.
http://www.napaonline.com/Catalog/Catal ... 81982&An=0
It fit my 07, are the threads the same on the 10?
I tried it for a few rides, fan came on way too early. Went back to the 95~100 switch.
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January 11th, 2012, 02:43 PM   #6
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Re: thermo switch - fan kit.

I bought a used '10 FE 450 in early December. Several weeks ago I purchased and installed the Husaberg Fan Kit. I havent been able to ride on the trails yet here in Colorado due to snow and cold weather. Nonetheless, after installing the kit and running the bike in the driveway to see how long it takes to get the fan to turn on, I felt like it the OEM switch did not turn on soon enough (bike had to get real hot). I found a replacement switch that turns on at 95C and turns off at 90-91C (at least that is what is marked on the actual switch. I think the KTM/Husaberg OEM spec is something 100C/95C or 102/97C.

I had read here or elsewhere that you can use the fan switch from an '84 BMW 325E. I have recently ordered a number of items from www.rockauto.com and been really impressed with their cheap pricing and their quick delivery. So, I went looking for what was available from Rock Auto. They list over a dozen stock switches available for this model with a couple special order ones as well.

If you go to their catalog (www.rockauto.com), click on start button, click on BMW, 1984, 325E, Electrical Switch & Relay, and then choose Radiator Fan Switch to see the available listings. The prices of the switches range from $4.45 to $24.79 for the stock items (with various brands and on/off temperatures). Be sure to get the TWO prong temperature sensor. They incorrectly show 1 item with a 1 prong connector among the choices.

I ended up picking up the Beck/Arnley 2011310 switch which is a 95C/91C switch. Cost was $13.65. Shipping to my zip code (Denver, Colorado) was $1.61. The Beck/Arnley 99C/95 switch (2011312) is $5.75 with $1.64 shipping.
There are several other brands that you may like better with varying temp specs (and some are hard to tell the exact specs unless it mentions in the description).

Here is the link:
http://www.rockauto.com/catalog/raframecatalog.php

I can assure you the Beck/Arnley switch I purchased (2011310) is an exact fit/copy to the 2010 OEM switch with the exception of lower on/off temp.

FYI....I know it sounds like a sales pitch above, but I have no affiliation with Rock Auto. I have used them about 5-6 times for auto parts and have been impressed every time with the speedy delivery and what seems like reasonable prices. But, I didnt scour the internet looking for the absolute lowest price. For all I know some other places have it cheaper, but I wanted to offer this one up as an option.

This radiator fan switch is also not unique to one model BMW. They list about 21 different BMW models that it fits all with multiple years. I dont believe the year/model listed earlier in this thread was one of them, but I am not absolutely sure.
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April 12th, 2012, 05:47 PM   #7
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Re: thermo switch - fan kit.

Just installed the fan on my new 2011 FE570 then let the engine idle and waited for the fan to engage. The radiator coolant boiled over and no fan engagement. Checked the fuse - good. Recheck the simple wiring - good. Then disconnected the thermo fan switch connectors, held them together to bypass the thermo fan switch to complete the circuit and turned on the ignition - nothing.
Question: what next?
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April 13th, 2012, 08:10 AM   #8
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Re: thermo switch - fan kit.

Check to make sure that you have 12V to the fan thermo-switch. If the fan fuse is good and you have 12V to the thermo-switch and the fan doesn't run when the terminals are shorted something is wrong with the fan. Does the fan blade turn freely?
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April 13th, 2012, 08:17 AM   #9
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Re: thermo switch - fan kit.

Check all connections and draw a diagram and make sure it makes sense.

Buzz it out with a meter and make sure you have +V where it's supposed to be hot, and ground where it's supposed to be ground.

Make sure nothing's blocking the fan from turning.

If it's getting juice, it could be a bad motor.
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April 13th, 2012, 01:58 PM   #10
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Re: thermo switch - fan kit.

Thanks, Chas and Oldnewbie. Fan blades turn freely. What do you mean by +V? The electrical connects seemed pretty straight forward without any unplugged connectors.
Ordering a 95/91 C fan switch through Rockauto. Hope this cools things off.
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