Radiator Fan - '04 Rev3 250

[russd]

The fan on my bike pretty much runs all the time. Have new coolant, impellar is fine, bike runs good. Seems like it should cycle on/off more often but I'm new to the bike. Is this normal?

Ambient conditions are on average 16C (60F).

thanks.

[bob]

if the fan is definitely cutting in and out then it is probably a faulty thermostat, if the fan runs right from a cold start then somebody may have wired it on permanently as a workaround for a faulty thermostat.

I dont think the rad cap would be the problem, providing that it isn't losing water from it.

16 degrees C is quite warm though, and you would expect the fan to run regularly under these conditions, depends how you ride the bike too, how fast and at what rpm etc.

Bob

[russd]

Thanks for the tips!

Out of curiosity, what are the signs that the bike is overheating or very near, less spewing coolant from the cap?

thanks.

[bob]

If the bike is overheating then you will notice that it will pink and knock a lot, it might feel like it is starting to bog down when you open the throttle.

Providing that air can freely pass through the rad then I shouldn't have thought that it is overheating, the fact that the fan is running a lot suggests good circulation of coolant to supply heat to the thermostat. I would put my money on a sensitive thermostat, perhaps worth checking your carburation, too lean and it will run hot as well, although that is the last point of call.

Good luck,

Bob