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Old August 2nd, 2018, 10:18 AM   #1
Norway
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Any way of checking functionality of the fan without excessive heating of the engine?

It stroke my mind that during my 52500 km (~32500 miles) on my 2011 Ninja 250R i never noticed any sound from the cooling fan, ever.

These days several new temperature records were set throughout Norway (in Scandinavia), where temperatures got above 32 degrees C (90 degrees F).
Normally the air temperatures would probably help a lot in cooling down the engine at our latitudes.
( https://www.google.com/maps/@63.5148678,1.4846052,5z )

The 250 has a temperature gauge instead of the fuel gauge found on many bikes.

Some times the engine temperature went to around 60 % of full scale, while it normally stays around an estimated 15 %. Think I must have shut off the engine from time to time, when it was at at least 40 % of full scale (temperature).

When does the fan normally "kick in"? Do you find it strange that I never heard the fan, taking into account that I'm far from deaf ? ;-)
Any simple way to check if the fan COULD possibly run, without letting the engine run hotter than what is "healthy" for it?

Thanks!
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Old August 2nd, 2018, 11:12 AM   #2
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Un plug the temp sensor and Jump the leads with a suitable piece of metal or wire that can handle 10 amps.
On your model the fan switch may be in the radiator. And the temp gauge is at the thermostat. Those two readings can differ.
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Old August 2nd, 2018, 01:18 PM   #3
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Of course if you want to check the fan thermostat without heating up the engine, you can take it out and put it in boiling water, with an ohm meter connected.

I just let my 250 idle in the driveway and kept an eye on the coolant temperature. The fan came on well before the gauge showed excessive temperature.
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Old August 2nd, 2018, 01:36 PM   #4
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You can also lean down and take a look to see if fan’s spinning. It’s very quiet, can’t hear it until you come to complete stop in quiet area with no traffic.
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Old August 2nd, 2018, 03:54 PM   #5
Ceeloo Yello
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Also check the fuse for the fan.
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Old August 3rd, 2018, 06:02 AM   #6
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As TJ noted, the fan should kick on well before you are getting close to the red.

I would go for a normal ride, then come home and let it idle until the fan kicks on or you start to see the temps rise near the red. Just keep an eye on it.

If you are running a good synthetic oil you don't need to worry about high temps - the oil can handle it without breaking-down and losing viscosity like conventional oil.

At the track, oil temps run over 300F (normal oil temp is 212F) consistently without any problems, as long as you have the right oil.
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Old August 4th, 2018, 11:29 AM   #7
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Just short the terminals that would normally hook up to the temp sensor in the left side of your radiator. That will make the bike think that the sensor has seen high temp and turn the fan on.

best part is the fan is wired hot to the battery separate of the ignition, so shorting those two pins in that connector will turn on the fan without needing the key in the ignition or the engine run.

Boom.
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