Lots of good responses already.
I, too, would ask what makes you think it's overheating? First real sign of overheating, idiot lights aside, is the overflow peeing out the top. If the overflow is normal - coolant in between the min and max lines, I'm not clear on why you think it's overheating.?.?
The fan can be checked by applying 12v to the connector. If the fan is bad, you can buy a direct replacement from SPAL for 1/3'rd of what Polaris charges. Same fan.
Rough check the water pump by taking the radiator cap off (when cold), start the bike, get it up to temp. Once the thermostat opens, you should be able to see the coolant flowing inside, across the radiator cap opening. Should flow faster with engine RPMs.
Test thermostat by pulling it out, and placing in a pot of hot/boiling water.
Sensors are a little harder to test. The fan switch, which is located in the bottom of the radiator, can be 'tested' by elimination. If you tested the fan and its ok, yet the quad overheats without kicking on the fan, it's probable that the fan switch is bad. BTW - 2000 SP500's are known for failing fan switches. I've had to replace mine.
I've never tested the overheat light sensor, not sure on that one.
Again, I would make sure it's really overheating before doing all this work.
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