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Hi,

I have a grizzly 2002, the fan was always on since i bought it, the radiator was bad so i decided to replace it with an aftermarket radiator and a new aftermarket temp sensor. The problem is i never see the fan starting. i tested the fan individually and is working. Today i ride it on the town for about an hour and when i shut it down i see the radiator returning coolant to the resevoir and coolant going out from the reservoir hose.

Hope can help me.
 

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Test the sensor/thermoswitch itself. I bet it's the problem.
After installing several of these aftermarket thermosensors, and every one being bad out of the box or incorrectly manufactured, I gave up on them. I now only use OEM thermoswitches.
 
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