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I think I have seen a prior post about this but can't seem to find it now. My fan runs constantly. It come on at startup (when the bike is cold) and doesn't shut off. This happened after having it in a rain storm. Is the thermostat bad? It is a 2004 BH350. Fan was working correctly before this. Thanks for any help.
 

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Fan Thermo

I've had 2 go bad on my 04'. It's a NAPA PART # FS120. On the right front side of the intake manifold you will see 2 wires going to the thermo- switch. Suck about 2 quarts of fluid from thr radiator first before removing the switch. You might want to trim the top of the switch with a dremel tool until it's flush so it dosen't hold water.....Ray
 

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Fan

I don't mean to step on anyone's toes, but...

There are two components in the wiring that could cause this. The thermostatic switch located at the front of the manifold or the relay operated by the thermostatic switch.

I would start by pulling the wire/s off of the thermostatic switch. Turn on the key. If the fan does not run, it is the switch. If the fan still runs, locate the relay under the neck of the frame. Remove the relay and turn on the key. If the fan does not run, it is the relay. If neither of these steps stops the fan from running, you have a wiring problem.
 

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I had my first fan replaced around 17,000 miles. I just turned 36,000 miles today(5 June 2005), and the fan just quit. I guess I'm going to learn how to replace the fan by myself this time! I also plan to replace my 180 degree fan thermostat switch with the 195 degree NAPA FS-120 switch.
Thanks for the tip about removing about 2 quarts of coolant out of the radiator. That'll save me from loosening a connection at the bottom.
 
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