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
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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 https://www.vn750.com/forum/forumdisplay.php?f=46 theres probably a step by step on the coolant flush on here somewhere. i used the clymer manual when I did mine.

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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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