Sudden overheat, overflow tank burst - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 09-24-2017, 12:22 PM Thread Starter
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Sudden overheat, overflow tank burst

So today, an 85 degree day, I took my Vulcan out for a ride which was about 40 miles total. Everything was fine, until I stopped for about a minute in a shaded area. Suddenly, the temperature rose (but did not touch the red), & it started shooting coolant out of the overflow hose, and suddenly, the overflow bottle cracked at the top, letting more coolant and steam out. I managed to ride the bike home without it reaching the red zone (though a little hotter than usual). What could have caused this to happen?

I did not check to see if the fans had turned on. However, I did not hear them, so I assume they did not. Also, I had replaced the coolant with Prestone 50/50. When I had done this, I left the bleeder valve open, and closed it when the radiator was full. Should I let it run with the bleeder open to let the rest of the air out?

So while I await my new overflow bottle, what could have caused this to happen?

I have also just checked out the electrical connection at the bottom corner of the radiator. It seemed loose and as if no contact was made. Is this what would activate the fans?

Last edited by SergheiS; 09-24-2017 at 12:48 PM.
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post #2 of 5 (permalink) Old 09-24-2017, 01:19 PM
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Yes, the switch on the bottom left of the radiator is the fan switch. Jump a ground wire to that switch and it should run, even with the key off.

Bleeding should be done after the engine has warmed, thermostat has opened, and the radiator topped off with antifreeze, radiator cap in place, engine running.

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__________________________________________________ ____________
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post #3 of 5 (permalink) Old 09-24-2017, 01:38 PM Thread Starter
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Yes, the switch on the bottom left of the radiator is the fan switch. Jump a ground wire to that switch and it should run, even with the key off.

Bleeding should be done after the engine has warmed, thermostat has opened, and the radiator topped off with antifreeze, radiator cap in place, engine running.


I will try to repair said switch, & try bleeding the system again. On another note, is prestone 50/50 ok to use in these bikes, or is there another type I should put in?
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post #4 of 5 (permalink) Old 09-24-2017, 01:49 PM
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Quote:
Originally Posted by SergheiS View Post
I will try to repair said switch, & try bleeding the system again. On another note, is prestone 50/50 ok to use in these bikes, or is there another type I should put in?
Any antifreeze that is silicate-free. I can't say for sure on the Prestone, check the label. Maybe someone that knows will answer. Green, always green antifreeze, no red death.

According to this, it's ok, but the info is from 2011.

Quote:
Prestone Regular or 50/50 is a silicate free OAT antifreeze. It uses phosphates to replaces the silicates.Jun 13, 2011

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__________________________________________________ ____________
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post #5 of 5 (permalink) Old 09-24-2017, 09:39 PM Thread Starter
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One more question, is bleeding the cooling system here the same as on a car? Let it warm up, open the bleeder screw, let it shoot some coolant, close, or is there another way?
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