Cleaning the Radiator - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 05-13-2014, 10:34 PM Thread Starter
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Cleaning the Radiator

Good evening,

I was wondering what's the best way to clean the radiator. I been having issues with my cooling fan. After replacing the fuse box, the thermostat plug and making sure connections are good; the fan comes on exactly when it needs to. However the problem is that the fan won't turn off after the bike has been turned off. I have to actually pull the thermostat sensor plug connection off in order for the fan to turn off. I was told I need a good radiator cleaning. I am not that savvy with things like that. So I ask for help from the forum as to a very detailed step by step "RADIATOR CLEANING FOR DUMMIE" instructions of doing this process. Or do you recommend just taking it yo a bike mechanic..

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post #2 of 5 (permalink) Old 05-13-2014, 10:45 PM
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My fan will sometimes run after the key is off. If 'heat soak' is bad, it is supposed to. It does not run long.
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post #3 of 5 (permalink) Old 05-13-2014, 10:50 PM Thread Starter
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The fan ran for ten minutes after the bike was off. I am not sure that is normal.

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post #4 of 5 (permalink) Old 05-13-2014, 10:58 PM
'03 VN750 "Rosie"
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Mine will sometimes run after shutoff too, but for less than a minute. If yours runs longer then you need to fix it. As for the radiator, you should probably drain and flush it every two years. You'll find information on both here theres probably a step by step on the coolant flush on here somewhere. i used the clymer manual when I did mine.

'03 VN750 "Rosie"
Purchased in June 15, 2010
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Last edited by bstew7890; 05-13-2014 at 11:06 PM. Reason: correction
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post #5 of 5 (permalink) Old 05-13-2014, 11:04 PM
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Mine runs about 1-2 minutes after shutting down on a hot day, 10 minutes sounds a bit long. A standard radiator flush from any auto store won't hurt and takes about an hour. Your next step up is going to a mechanic and getting a reverse flush assuming they can do it with the smaller hoses a motorcycle has. The ultimate is a radiator acid dip but not many places offer it anymore with EPA regs making it so hard dealing with the chemicals.

Instead try a regular flush from the auto store and on very hot days let your engine idol 1 minute before shutting down so the water pump can even out engine temps.

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Last edited by Spencer1; 05-13-2014 at 11:13 PM.
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