cooling system - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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\ From the radiator, through the case and out
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post #1 of 4 (permalink) Old 06-20-2012, 09:23 PM Thread Starter
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cooling system

my expansion tank is over pressurizing. whats up? also fan isnt coming on
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post #2 of 4 (permalink) Old 06-20-2012, 09:55 PM
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The above bike has had the thermostat replaced and a flush a fill, but still overheats on hot days.
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post #3 of 4 (permalink) Old 06-20-2012, 10:51 PM
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Fan not coming on is a clue!!!!! Air in system-clogged radiator--thermo switch on bottom of rad is a good start! You can at least bypass that to get fan working.

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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post #4 of 4 (permalink) Old 06-21-2012, 12:55 AM
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Quote:
Originally Posted by romeobravo172 View Post
Fan not coming on is a clue!!!!! Air in system-clogged radiator--thermo switch on bottom of rad is a good start! You can at least bypass that to get fan working.
That thermo switch on the lower left side of the rad, is a ground back to a relay I believe, in the junction/fuse box under the left side cover.
Pull the connector off and inspect for corrosion or damage.
Slide it on and off a few times to mechanically clean it.
Try grounding the connector on the wire with an additional jumper wire to bare metal or the negative battery terminal to determine if the fan works.

If the fan works with a good ground, the thermo switch likely needs replacing.

Then spray with some electrical contact cleaner, and pack the connector with a dab of dielectric grease to prevent future corrosion.

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/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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