Hi guys, ok so I've been reading countless threads on this topic. Basically my radiator fan USED to come on around 225-227, however, it stopped doing that, i've run it up to about 236 and it hasn't come on.
I replaced the thermal switch, didn't work ($50 bucks down the drain)

SO I decided to hardwire a switch, that wasn't a problem, BUT when I did so, I started by turning on the ignition, not to start the bike, just to power it, then I grounded the fan wire that was connected to the thermal switch, the fan starts and sounds fine, only it spins so that air is being pulled away from the radiator. So when I flip the switch it doesn't cool the temp, in fact, it seems like it heats up even faster.

My question is that isn't the radiator fan supposed to blow air on the radiator? not suck air from it? If someone could just check which way their's spins, or if you know that'd be great. And if it is spinning in the wrong direction, do you think it's frayed wire somewhere or somehow the (+) and (-) wires for the fan got switched? or does the thermal switch reverse current maybe? THANKS!

-Mike

 

Not that I claim to be the master (since I'm only going to pick up my bike tomorrow), but I believe that pulling the hot air off of the radiator would pull cooler air into the low pressure area left by the warm air that just moved. *shrug* Perhaps my thermal physics is screwy. I dunno. Just food for thought. Good Luck with the fan though.

 

I haven't checked out the fan motor on my bike but if it's probably like a typical electric motor for the most part so if you were to flip the wires around reversing the plurality it should most likely change the direction that the fan turns.

 

I concur with the aforementioned statements. FWIW All the fans I've ever seen pull air through the fins and dito on "reversing the plurality"

 

I am sure that the air should retain the flow direction, and the fan should just speed the air up so the more heat should be taken from the radiator.
Now, if the fan is behind the radiator - it should "suck" the air, and if the fan is in front of radiator, it should blow air on it... Common sense