Fan Not Cycling - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 4 Old 09-06-2016, 10:39 AM Thread Starter
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Fan Not Cycling

Hi All,

I think I am having an issue but I am not really sure. Last week my the bottom radiator hose came off of my 750 on my way to work. My local HD dealer came and picked it up and replaced the the clamp and refilled the system. Since then, the bikes radiator fan operation has changed. It used to come on and go off at random while I ride, usually when I am stuck at a light or in traffic, but it would then turn off once I got moving again. Now it comes on and stays on for the duration of the ride, never shutting off until the bike is shutoff (even then it takes several minutes for it to shut off). Any ideas?

Thanks,
Sean
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post #2 of 4 Old 09-06-2016, 03:52 PM
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Might be a problem with the thermostat as well especially if it isn't regulating properly. I would take the bike in and have that checked on their dime.
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post #3 of 4 Old 09-06-2016, 07:19 PM
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Possibly Air trapped in the system. Scan tool (Or FP3) would show the Temperature of the engine. And when it reads above a certain point, The Fan turns on.


The Radiator Cap is underneath the Gas Tank.

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post #4 of 4 Old 09-08-2016, 04:24 PM
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The fan is supposed to come on at like 200-210 range if I'm not mistaken. If it's staying on all the time, either your bike is running above that temp all the time (could be an air bubble in the cooling system) or you have a bad thermocouple on the fan causing it to think it's running hot. Take it back to HD and let them sort it out.
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