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Posted by Mike922
 - June 20, 2014, 09:50:49 AM

49Reo, Troll,

Appreciate the replies.  Possibly I just hasn't needed to come on yet, when I changed the fluids it was right to the top of the radiator and overflow tank was at the correct mark, no fluid change in 2 years (5000 miles).
I had read the previous post about the fan not coming on and I became paranoid perhaps?
But it always came on after a ride, when I turned off the bike, and had stopped.  Not for long, but it did run.
thanks, Mike

Posted by 49Reo
 - June 19, 2014, 21:08:41 PM

Check the thermal switch; when the prescribed temperature is reached, the switch grounds out, (closes) fan comes on. When it fails, it will not close. Also, it takes a lot of hard work to get it hot enough to come on. Mine has only come 2-3 times in its life.  :-\

Posted by Troll
 - June 19, 2014, 20:05:16 PM

Did you jump across the two terminals in the switch plug? That will test the whole circuit. Check the wiring diagram carefully. A bad ground will also keep it from turning on.

Posted by Mike922
 - June 19, 2014, 19:55:32 PM

I also have this problem.  Checked fuse is ok, fan works jumped to the battery, replaced the fan switch into the radiator, still no working fan.  Any thoughts on the next step.
I've yet to have it overheat or a temp warning light come on, but my rides are short and not much stop and go traffic at all.  Also used the tip about raising the tank instead of removing to access the radiator cap, that worked well, thanks.

Posted by chief
 - June 09, 2014, 11:46:42 AM

FYI

The thermostat opens and closes to keep the coolant within operating range. The thermostat starts opening at 136-144F (58-62C) and is fully open at about 167F (75C).[/size]The fan doesn't come on until the coolant reaches between 212 and 230F(100-110C) and it will go off again at between 207-217(97-103C).
Posted by Troll
 - June 07, 2014, 10:16:55 AM

OR...easier, yet...pull the 2 wire plug from the BIG switch on the bottom of the radiator, and take a paper clip and jump across the two terminals inside the plug (not the switch). The circuit is completely independent of the computer, the ignition, or anything else. it's completely stand alone, an works with the key on or off. I'll scan a wiring diagram and post it  in a few minutes...

Posted by greenbarn
 - June 07, 2014, 08:06:03 AM

Is it not running during times when (form past experience) you're sure it should be running??   It could be a bad fan motor, fan relay, wiring, temperature sender, or ECU.  Seems like I've heard of someone else's fan motor going bad.  You can test the motor by unplugging it and  jumping 12v (and a ground)  to the fan motor,  either from the bike's battery, or a jumper-pack. 

Posted by James
 - June 07, 2014, 07:46:16 AM

I have a 1999 Drifter 1500 and the electric fan has stopped working any suggestion on what could cause this. I replaced the fuse, no change. I have plenty of coolant, but wonder if the fan not working will cause any engine damage.  Any help would be appreciated. Jim

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