Repair a Fan Switch

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Mark King
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Repair a Fan Switch

Post #1 by Mark King » Wed Aug 17, 2011 9:23 am

You might be able to repair your current fan switch by simply cleaning it with vinegar. Especially in older bikes that sit, or have sat sometimes for years, the switch can become gummed up and stuck.

The switch is actually three pieces and the end cap is removable.

Because this part sits in the coolant it attracts the same gunk that plugs your rad.

Easy step by step process - and I'll add pics below when I remember how to do it.

1. After the switch is removed from the bike it is best to soak it for a few hours in a straight vinegar bath. This helps break up any corrosion that has accumulated on the threads that hold the end cap.

2. Firmly grip the main body of the switch - I used a hand held pair of vice grips where the wrench would normally go.

3. DO NOT GRIP OR TURN THE END PROBE - WHICH IS THE COPPER PIECE ON THE END.

4. Underneath this end probe, there is a small and very short shaft and then a slightly larger piece. In profile there are eight distinct sections of the switch. You are looking for the third distinct piece counting the end probe as number one. (Shown better in the photos)

5. Grip this third section with a needle nose vice grip and turn it gently to unscrew it. It will take some effort but not much. If you are stripping metal off it like I did at first, it probably needs to soak longer.

6. Once the end piece is removed you will see a pin that is supposed to slide freely inside.

7. Soak the end piece with the pin in vinegar overnight and it should loosen enough to pull the pin out. If not, let it soak some more.

8. When the pin is removed, use your fingernail to scrape off any more residue that may be stuck on it and clean out the hole where it sits. I used a toothpick and vinegar bath.

9. Once clean, the pin should slide very easily in and out of the hole.

10. Re-assemble.

11. Test, or not, to suit but should probably test as this will only work if the switch is broken because the pin is stuck.

Image

Image

Image

Hope the pics attached ok. If not I will add them again later.
Last edited by Mark King on Tue Aug 23, 2011 3:40 pm, edited 1 time in total.
M King
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sunnbobb
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Re: Repair a Fan Switch

Post #2 by sunnbobb » Wed Aug 17, 2011 9:40 am

I'll be dad-gummed! That is a fine little tutorial, thanks bunches!
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Roady
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Re: Repair a Fan Switch

Post #3 by Roady » Wed Aug 17, 2011 10:46 am

I had no idea ...

Worth trying on the old one (which never got thrown out, of course).

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Re: Repair a Fan Switch

Post #4 by JBz » Wed Aug 17, 2011 11:34 am

my experience is the bottom contacts stay good. The top piece with the powdery stuff in it goes bad or collects moisture past its special seal and messes things up like the sliding pin. i cut one top piece apart in the lathe to take a look . If just the top part that screws out was available I imagine most could be saved. JB
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The Subliminator
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Re: Repair a Fan Switch

Post #5 by The Subliminator » Mon Aug 29, 2011 3:12 pm

Having some trouble on this very thing and I'm a long way from home. Does any one have part numbers for the automotive ones that fit?

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Re: Repair a Fan Switch

Post #6 by ericheath » Mon Aug 29, 2011 5:45 pm

FAN SWITCH
roady did the research for this, i didnt see it here in this list so here is the link to his post. octane posted the interchange list and it will fit a bunch of gl's.
viewtopic. ... 3965#63965
here is the link to rock auto
http://www.rockauto.com/catalog/raframecatalog.php
click on part number search
here is the part number
2011614
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lt1
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Re: Repair a Fan Switch

Post #7 by lt1 » Fri Sep 09, 2011 12:22 am

Doing the vinegar soak in combination with an ultrasonic cleaner may speed up the process.
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Re: Repair a Fan Switch

Post #8 by Wingerinsandiego » Tue Apr 22, 2014 1:39 pm

Great tutorial Whiskerfish! I am getting ready to check the temp sensor which is down line from the fan switch. Would be great to see a step by step on how to get to (right now I may have to remove the carbs) if it is repairable, etc. My temp guage is not working and this sensor is where hopefully my adventure ends. Thanks
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Re: Repair a Fan Switch

Post #9 by fish » Fri Jun 13, 2014 11:57 pm

mark thank you.
I just did this on a friends bike & it was a FIX!
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Re: Repair a Fan Switch

Post #10 by djoyner » Sat Apr 04, 2015 3:31 pm

I know this is an old thread, but I wanted to thank Mark for this tutorial. I picked up a '79 about a month ago and noticed that the PO hand installed a switch to active the radiator fan. I followed the excellent directions and the switch works great now.

Thanks again...now onto rebuilding the carbs.
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