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Who's faster Lupi
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4,957 Posts
Discussion Starter #1
The 9R been giving me fits overheating. I changed the oil and coolant. Seemed to fix, but the heating problem came back. I dont think the fan is working properly. I cant remember hearing it lately. I know its not frozen. The fuse is ok. I'm thinkin thermostat. But there is another switch just under the thermostat. Not sure what it does yet. 1 good thing though, in looking at whats going on, I found a loose coolant hose that would have been nasty while riding if it let loose. Any ideas where to start.
 

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Registered
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5,002 Posts
The switch under the thermostat is probably the fan switch. You could start by disconnecting that and run the bike until it heats up to see if the switch closes. Use an ohm meter to see if the switch closes.

If it's overheating the fan should be on.

You should also check for an air bubble in the radiator. When the bike is cool, remove the radiator cap and fill with coolant mixture to the top. An air bubble at the top of the radiator can cause overheating and the fan to not work properly, as well as not exchanging fluid with the reservoir properly.
 

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Evil Moderatrix,
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8,030 Posts
If yer fan blades are plastic, you might have to trim them.
 

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Who's faster Lupi
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4,957 Posts
Discussion Starter #5
the fan is plastic. It is free spinning and I do not hear any rubbing when turned by hand. It did kick on today but not long. It was cooler out on my ride in. The temp guage did not show over heating. I did try to get gid of any bubbles in the line when I rilled her up the last time. Burped the lines and all. I'll check that switch with my meter tonight. Good idea. And I will have it at lunch so we might look at it.
 

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Who's faster Lupi
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4,957 Posts
Discussion Starter #6
Ok Ron I crossed the switch wires like you said and the fan goes on. So its no the fan. It didn't overheat this morning or at lunch. And the fan kicked on on my way home. So it seems its a bit random. I guess I'll just keep an eye on it.
 

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Lovin this Twin
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1,980 Posts
Welcome to the world of HOT running Kawasakis

Its not your thermostat and Im sure its not your fluid levels.

there is 1 possibly 2 sensors on your bike that tells the fan to turn on Ill bet money one of them is not working


you can fix it or be a cheap ass like me and put a toggle switch on the fan so you can turn it on and off whenever you want.

Check your manual and see how many sensors you have on your year bike Mine has 2
 

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Who's faster Lupi
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4,957 Posts
Discussion Starter #8
well I checked and I found one and the fan works. It hasn't overheated lately so I'll be a cheap ass and let it go for now.
 
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