Just finished removing my radiator to repair my fan that was sticking on the fan shroud. Once I had sorted it I stuck a flathead screwdriver in the end of the wire that comes from the fan switch in the radiator to the fan and touched the frame and the fan came to life so I know it's working.

I put everything together and replaced the coolant. I then ran the bike and it reached normal running temp and kept climbing and the fan didn't come on.

What do I check next, the fan motor switch or the thermostat and how do I go about checking if they work or not.

Cheers

 

It seems like you already checked the fan switch. You could try replacing the terminal that connects to it. The terminals on my horn were corroded and the horn stopped working. May not fix it but its cheap enough to try.

To check the thermostat, you can boil it and see if it opens if you feel like taking it out. Or just feel the 2 hoses and see if they're both hot. If one is hot and the other is cold, that's your problem.

 

Test the switch for real. Make sure it has continuity to ground when hot.

 

This is going to sound dumb, but did you check the fuse?

 

Could you give me a quick description on how to test that is has continuity to ground when hot please.

Not dumb at all. I asked where the fuse was in a previous question and replaced the one that had blown before I sorted the fan.

I am fairly clueless when it comes to this stuff but want to learn as much as I can so thanks for the help guys.

 

I checked the hose that comes from the thermostat to the radiator and that was hot but I couldn't realy get to the one that goes from the radiator to the water pump and don't want to start removing fairing parts at 11.15 pm so I will check that one when I get back home tomorrow night.

Cheers for the help.

 

Could you give me a quick description on how to test that is has continuity to ground when hot please.

Sure. Put an ohmmeter between the connector and ground. When it reaches temp, the circuit will go from open to closed and show continuity. All the switch does is ground the wire to turn on the fan, like what you did with the screwdriver. Make sure the coolant in the radiator gets hot (over 220) with the thermostat open.

 

Cheers Demon. I'll stop and pick up an ohmmeter from my friend and give it a test.

 

AlsO your fan motor might be shot. I just tried hardwiring it all by connecting the ground to te frame but I still get nothing. Meh I'll replace it one day