After reading many posts I see the fan comes on by the grounding of the switch on the top of the right radiator at about 217 f. I see some guys have installed a switch to turn it on at will. Does anybody know of a switch that closes at about 190f. Why wait for the bike to get to 217f before action is taken, it would be a lot cooler on the legs in traffic.

 

Nissan part number 21595-01A00... switches on at about 195, off at about 185. Go to your local auto store and find the cheapest one. It should be around twenty bucks.

It has a separate ground terminal, so you'll have to run a wire to your frame, otherwise the thread pitch is the same and it just screws right in.

 

I watch my temp like a hawk, therefore I prefer to have a manual switch which I rigged with some parts from Radio Shack. E- mail me if you're interested in the specs I used. Pretty straight forward install.
Patton303@gmail.com. : )

 

I think once the engine is hot it's going to be hot. I'm not so sure you're going to tell much of a difference if the fan kicks on at 195° or 217°. But it will be interesting to see what you think of it once you do it! Keep us posted!

 

I think I will just go w/ the switch- a lighted one- so I don't forget it's on as the fan is pretty quiet. Thanks for the part # of the fan switch but not sure if that cut on switch is low enough. The temp on the gage- newer hawks- is the temp coming directly out of the eng at the thermostat. the temp the fan comes on 216f on the gage is really not the temp the fan switch is seeing , it is much lower, it is the coolest temp in the system after the radiators just before it goes back to the waterpump. I am curious, if anyone is about to do a coolant change and has the syst open, remove the fan switch. Place it in a pyrex cup of water on the stove hooked to an ohm meter w/ a thermometer in the water. Find out what the actual on/off range the fan switch operates. it won't be 216 on 210 off but lower.

 

So yes you will notice when it comes on early cuz it keeps it cooler. I have been obsessing over this for a year now.

The dilemma with the cute lighted switch is that it cant handle fan power without a relay. It will be cute for a minute & then melt at the worst possible time. You could just get a 30amp switch like I did.

I also got a low temp fan switch (90c). I tried an 80* one but the fan ran too much. Just make sure you DONT DEFEAT THE STOCK SWITCH. You will forget and kill the bike.

I could not find that nissan switch anywhere so got a honda one off fleabay.

 

I checked the wiring diagram, looks like the fan fuse is 10 amps so I bought a 20 amp switch. I tee'ed into the wire going to the orig. switch so it will still come on if I don't throw the switch. I also used the same gauge wire. I'll have it done in a few days, other projects going

 

That's what I did.... A 30 amp switch.... And presto....

 

Great mod! easy and cheap with a big payoff. Temp has not exceeded 190 even sitting in traffic at 90 degrees. Turn it on when I think I will be stopped for a while and the bike never gets to uncomfortable. Fan shuts off w/ the ignition switch so if I forget to turn it off I won't run the battery down.

 

I have the switch but dont like the distraction so am going with the lower temp auto switch. Similar result but no distraction plus I can turn it on if I want.

 

I see what u mean by the distraction, right now it's cool a new switch to play with but if u can come up with a part # for a switch in that perfect temp range I would do it. I mounted the switch on the left side frame just behind the steering head on that black sticker. I can flip it w/out taking my hand off the throttle or brake. Thanks Smokin joe