Radiator fan not working

If the engine is hot then this is normal, if it runs on for more than a few minutes you should have it checked. A couple of minutes running after switch off is entirely normal.

Its your fan control module. It will be located on the driver side inder the breather box assembly. If you need a diagram of where the part is or the part number let me know. hope this helps

It can be the Heat Sensor or there is not enough Water in the cooling System and the sensor Gives Signal to cool down with switching on the Fan .

It actually supposed to work like this. It should turn off in a couple of minutes. Give it a try. Wait for like 10 min to see if it will stop.

Hello. Start your bike and let it idle for 10-15 min. Check the radiator fan, it should start running.
You cannot check if the radiator fan is working or not at random timings as the fan gets ON and OFF depending on the engine heat. (I got myself confused as my Bike's radiator fan was not alive even after a 100 KM run).
Happy riding with your R15!! Take care.

it is the radiator cooling fan. It can and does come on at any time! It will sometimes run right after turning of the engine, usually for no more than a minute or two depending on how hot it is. this is a normal operation. There is propbably a sticker on top of the radiator warning you of the fan's operation.

The thermostat on the radiator opens by heat automatically. The fan switch is run by the Engine temp Sensor and the ECM. If your fan is not running it is most likely a problem with the fan or the Temp sensor, I would look at the fan first.

Go up on roof and using a stick or similar, poke it through the air holes in side & try to turn the fan blade at rear of the air conditioner. Make sure it's off at the time. Try to get 2 or 3 complete revolutions of the fan blades, then try turning it on fan only first,and let it run on fan for a few minutes, then switch to cool. If worse comes to worse and you can't get blades to turn, remove cover on roof (watch for wasps & bees) and spin fan blades a few times by hand, step back & have someone try fan only. If that works, then try cool. Sometimes they get a dead spot from sitting, and that will get it going again, 90% of the time. Let me know how it goes.

Well, this is a water cooled bike. Few things can cause this:
1.) Low water in radiator.
2.)Dirty blocked clogged radiator fin openings, or clogged inner radiator with rust and sludge.
3.) Electric coolong fan not working- could be temp sensor, fan relay or fan motor itself.
4.) Worn radiator pressure cap.

Is your fan kicking on when your bike starts to get hot?

On my cbr the fan would kick on at 215 degrees. Even sitting in traffic on a 90 degree day my bike would only get up to 220 at most.

If your fan is kicking on when its suppose to and you have your radiator filled up full then I would check your thermostat.

The thermostat is an object that opens up when your engine reaches a temperature of around 180 degrees and lets antifreeze run through your engine to keep it cool. If the thermostat isn't opening up then the antifreeze isn't circulating through your engine, its just sitting inside your radiator. And that's not what you want.

You can remove the thermostat from your bike and put it in a pan of water and heat the water up with a candy thermometer in the water and you should see your thermostat open up at around 180 degree's. Just do this on the stove. The water won't be boiling so you will be able to see it open up.

Hopefully its just your thermostat because they are very cheap(around 10 bucks).

If your thermostat is good and your fans kick on when they are suppose to then I would say its a water temp sensor or a sensor period.

I'll bet though that if you take your bike for a ride and when it gets around 215 degrees that your fan isn't kicking on to help the motor cool back down.

Hopefully this is the case and if it is you can just run the fan wires to your battery and hook up a toggle switch to turn your fans on whenever you please. This is just a bandaid fix and not fixing the real problem but it will get you by until you can fix it the right way.

Well I hope I may have been of some assistance and good luck,
Remember to check your fluid while the bike is running and warmed up completely, because if you just fill your radiator with the bike turned off it will only fill your radiator with fluid and not your motor as well(because the thermostat will be closed) which is what you want. Also after you fill your radiator when the bike is running and you can fill it any more let the bike run for a little while with the cap off to let any air in the cooling system purge out of the open radiator. You should see some air bubbles coming out of the radiator cap hole. If you have air in the system that will cause your bike to overheat as well. Had this happen on a Honda Car.

GOOD LUCK,
AadoubleA

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