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Topic summary

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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