Fan Switch? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 03-19-2011, 05:36 PM Thread Starter
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Fan Switch?

Just finished rebuilding engine and during test ride the cooling fan did not come on. Troubleshot it to the fan switch; if I make the ground on the wire, the fan comes on.

My question is what are the odds it's really the fan switch? $70 for a new switch. I don't want to drop that kind of money on a part and not have it fix the problem (Wife is already reminding me how much rebuilding that engine cost...)

I could rig up a toggle switch, but then I'd have to rely on me to remember to turn it on. Disaster waiting to happen, there.

System looks kind of simple, but hoping I'm overlooking something...

1998 VN750
37,100 miles
Spline Lubed
2 Previous Owners
Rebuilt Top End at 33K
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post #2 of 7 (permalink) Old 03-19-2011, 06:40 PM
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If you pulled the wire off the thermo switch and ran it to ground, and the fan runs....then you may want to test the thermostat.... The switch should be conductive at around 200 deg. F, once it drops below that it goes to inf. resistance. you can try to test it on the stove in a pot of water.....like for a car thermostat....except I'm not sure how your going to rig it so the switch is dangling in the water while you take ohm measurements.....without burning yourself
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post #3 of 7 (permalink) Old 03-19-2011, 08:44 PM
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Quote:
Originally Posted by dariv View Post
If you pulled the wire off the thermo switch and ran it to ground, and the fan runs....then you may want to test the thermostat.... The switch should be conductive at around 200 deg. F, once it drops below that it goes to inf. resistance. you can try to test it on the stove in a pot of water.....like for a car thermostat....except I'm not sure how your going to rig it so the switch is dangling in the water while you take ohm measurements.....without burning yourself
Dangle the switch from a string supported by a stick resting on the pots edges.
Use some alligator clips to attach the test wires.
Directions in Clymer manual, and probably the online manual at TOC.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
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post #4 of 7 (permalink) Old 03-19-2011, 09:03 PM Thread Starter
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Hoss, how do I find this online manual? Seen it referred to a few times in the forum, but haven't been able to find it.

1998 VN750
37,100 miles
Spline Lubed
2 Previous Owners
Rebuilt Top End at 33K
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post #5 of 7 (permalink) Old 03-19-2011, 09:13 PM
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put "free manual" in the search bar.

Or just click here

1990 VN 750
First (hopefully last) time in the shop:
Carb rebuild New brakes front and back New radiator fan
I've done:
Spline Lube New (used - non-leaky) Gas Tank New Fork Seals New Pirelli tires New Yuasa Maintenance Free Battery
Fresh Dexcool coolant Upgraded Shunt-type R/R (Relocated) Headlight Bypass Stator tested - PASSED
Clutch Swap - EBC Street Racer Frictions with new eBayed steels ACCT to MCCT conversion
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post #6 of 7 (permalink) Old 03-19-2011, 09:18 PM
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Here: http://www.tocmanufacturing.com/File...nd%20Parts.pdf
I tried to load it in the last post, but it locked up on me so I gave up.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #7 of 7 (permalink) Old 03-20-2011, 04:04 PM Thread Starter
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Thanks, guys. It IS the switch. Spent $1.58 on a toggle switch so I can at least ride while I figure out where to get the cheapest switch. Put 35 miles on it today, running great. I appreciate all the help with the rebuild, you guys rock!

1998 VN750
37,100 miles
Spline Lubed
2 Previous Owners
Rebuilt Top End at 33K
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