I have a 2000' Sportsman 500 that overheated the 2nd last time we went out because the fan wound'nt come on. The fan is new 1.5 years ago and I ruled out the fan gone again by wiring the fan direct to the battery, and that is how we went for a ride today running the fan steady to avoid overheating the motor.
My question is where is the fan switch to turn the fan on when required . I see what looks like could be a thermostat on the left side of the motor. But there is also something on the bottom of the rad on the right hand side.
I only want to replace the one part that is needed but I am not sure what it is . If anyone knows, I would appreciate it if you could help me out. And how much it should cost for this part. I am in Ontario Canada and I know that parts can often be purchased from the States cheaper even when shipping has to be paid also.
Thanks Chemysportsman

 

sounds like the sensor is gone.

 

Short Answer: Bottom, right, inside of the radiator is the fan switch.

Longer Answer:

http://forums.atvconnection.com/pola...-no-light.html
http://forums.atvconnection.com/pola...2-500-hot.html
http://forums.atvconnection.com/pola...an-sensor.html

 

Where do you ride in Ontario?
I am from Muskoka area..................I would check the wiring for it all first...
.....Caper........

 

I had a similar problem and here are a few other things to check if the above listed does not cover it.

Check for mud in the plug going to the fan, lol.

Check that the coolant is actually flowing into the radiator fast enough to warm it up enough to trigger the sensor. (I use a infrared non-contact thermometer for this, about $30 US.) It should be getting up to around 185 for the fan to start. If it is below that after the quad has been running for a while, you may have a lack of coolant flow somewhere.

Check that your voltage is high enough (above 12.5v) at the fan plug to run the fan. I am currently dealing with this issue on mine, possibly a bad stator connection. Could also be a battery, or any number of connections on the quad.

 

edit: duplicate posting. deleted.

 

I'm having similar issues with an '04 Sp700 in my stable. No fan actuation and 10 volts going to it. Sound like a fan switch? Also, is it in the same place as mentioned above? Thanks! Erik

 

If you only have 10 volts going to it, you need to find out why. What is the voltage at your battery? If you charge up the battery, does the voltage at the fan come up, drop all at once or slowly drop over time. If the voltage drops all at once, you may have a short somewhere. If it slowly drops over time, you may have a bad regulator.
If your battery has 13volts and your fan only has 10, you may have a loose connection somewhere or a bad relay or something to that effect.

A good wiring diagram will be your best friend either way.

 

I gotta really find a wiring diagram. I didn't have any time tonight to look at it, as I was replacing the lower front right A-arm bolt that fell out on the trail yesterday. Nothing worse than looking down and seeing your front tire under your footrest.

The battery was at 12v when I jumped the fan. I'll know more tomorrow. Thanks!

Erik

 

I live in Ontario too the Polaris Rad themal fan switch is $85 Canadian before tax. Just go to any auto parts store and say you need a fan switch for a 84-89 Nissan Maxama or a 86-89 Nissan Stansa.

I payed $32 + tax at Nappa Auto

Here are some themal switches they found for me.

Blue Streak TS-127
Nappa FS147
Wells SW526
This replace a Polaris 4010161 OEM switch. But you have to cut the old Switch wire and splices the new switch to yours old plug plug in. Which is simple Just two wires.

Remember to bleed the air out off your collant system when topping it up again.