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August 13th, 2012, 05:31 AM   #11
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Re: thermo switch - fan kit.

Could someone let me know what size the fan is? Spal makes radiator fans that look just like the fan from the kit, they have a 4" a 5.2" and 5.6" radiator fans. It would be cheaper to wire it up myself then to buy the fan kit.
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August 13th, 2012, 03:21 PM   #12
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Re: thermo switch - fan kit.

Jackrabbgit, the fan is roughly 4 inches in diameter.

OldNewbie, if you pull both wires off the radiator fan thermo switch and touch the contacts with the ignition on, shouldn't the fan run? If so, that would be a good test of both the fuse and the fan motor.
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August 15th, 2012, 07:49 AM   #13
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Re: thermo switch - fan kit.

Originally Posted by Ruger
Jackrabbgit, the fan is roughly 4 inches in diameter.

OldNewbie, if you pull both wires off the radiator fan thermo switch and touch the contacts with the ignition on, shouldn't the fan run? If so, that would be a good test of both the fuse and the fan motor.
Yup, that should do it. Maybe with ignition off, I don't know, my bike doesn't have ignition and the fan wire is always hot.

Side note - buy fuses and carry them with you. They're light, easy to change, and make things work a lot better.

My fan quit a couple weekends ago. I knew it had a fuse of its own when I installed it, but never bought spares....
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August 15th, 2012, 03:11 PM   #14
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Re: thermo switch - fan kit.

There is a bit of good info in this post:
radiator fan fuse keeps blowing
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September 12th, 2014, 07:42 AM   #15
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Originally Posted by SilvFx View Post
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).

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.
Digging up an old thread here I know, but I found this info useful. I installed the KTM fan kit on my 450 and the engine has to get quite a bit hotter than I'd prefer for the fan to come on. Ordered this part from ebay and should have it by Wednesday.

Hopefully this will remedy the issue. I should find out by next weekend.
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February 25th, 2015, 10:14 AM   #16
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How are you guys mounting the fan? Just using the pull through plastic cable/clip things?
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September 1st, 2015, 02:30 PM   #17
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bumping an old thread, but perhaps someone can help, and nice to keep all this info in one place!

I've noticed the fan (normal ktm fan kit) isn't coming on anymore on my 2011 390, did a test and confirmed that after idling for awhile it'll spew coolant all without the fan coming on.

So i've done some things i read in here:

Bridge the thermo switch connections - fan turns ON
Checked the fuse in the fan wiring - looks good
Checked the wiring connectors and they look good (just visual inspection)

If I bridge the thermo switch and the fan comes on, this proves the wiring is good, is that correct? Shows that it's getting power, etc... ?

Does this mean that the thermo switch is bad? I'm calling around to local places tomorrow checking if I can find one of the BMW type thermo switches mentioned.

Thanks!

jeff
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September 1st, 2015, 11:15 PM   #18
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Looks that way yes, change the thermo switch.
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September 2nd, 2015, 04:02 PM   #19
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Have the Beck thermo switch on order - will report back when it's in, thx!
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September 18th, 2015, 07:29 PM   #20
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Back in 2013 I replaced the factory thermo switch, and I don't believe that the fan has come on since. The factory switch is a 100/98 degree unit, and I replaced it with NAPA PN 1435033 which is a 95/90 degree unit. The fan runs when I jumper across the thermo switch connections, so I know the fan is fine. Hate to replace the thermo switch without knowing whether there's anything wrong with it, and I know they're difficult to test. Has anyone ever installed a manual switch for the fan? If so, please share your experience with that setup.
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