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2016 odes comrade.Fan won't come on ? Reservoir is emptying out through the overflow ?

Discussion in 'General ATV/Quad Discussion' started by Taralynn, Aug 6, 2020.

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  1. Taralynn

    Taralynn Tara SXS Nation Rookie

    Nov 8, 2019
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    Odes Comrade

    2016 odes comrade. Fan won't come on and reseveroir is emptying out the over flow tube?
  2. danielsmith5

    danielsmith5 Daniel SXS Nation Rookie

    Feb 5, 2020
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    2015 Polaris RZR 900S

    Well, one issue is the result of the other. If your fan isn't coming on, your engine/radiator will overheat and pressurize the reservoir which will force the water out of the overflow.
    Now, the bigger issue is figuring out why the fan isn't coming on.
    The most common reason is that the electrical connector has come loose from the fan or you have gotten water in the connector and/or blown the fuse due to a short. A less likely scenario is that the temp sensor has failed or the ECU which controls the fan has had a failure. If you have a temp gauge on the display and it shows the engine temperature changing then it but the sensor.
    To troubleshoot:
    1. Check the fuse! In your owners manual find the fuse for the fan and check it. If it's blown replace it, if it blows again you have a short, if it's not blown keep looking...
    2. Find the wires coming from the fan, follow them to the first connector you find. Carefully unplug the connector make sure there is no water or dirt in the connector, clean if there is. If you have dielectric grease, put a little on the contacts and around the seal and reconnect it. Run until it gets up to temp and see if the fan comes on, if it doesn't keep looking...
    3. Continue following the wires as far as you can looking for damage or breaks in the wires, if you come across another connector check it too.
    Testing the fan and/or wires... you will need a test light or multimeter.
    1. Testing for power: Run the machine until it gets up to temperature. Shut off your machine and disconnect the fan connector. Attach your test light or multimeter probes to the contacts on the connector. Start your machine and let it run for a few more minutes to make sure it's back up to temp. If the test light comes on or your multimeter reads 12v then you are getting power to the connector and the problem is your fan. If you are not getting power to the connector then the problem is a break in your wires or the fan controller in your ECU.
    2. Testing your fan: you will need a 12v battery, 12v source, or jumpers from the battery on the machine. CAUTION: Using this method will cause your fan to start spinning unexpectedly.
    Disconnect the fan connector. Using small electrical probes or wires, connect one lead to the positive pole of the battery and one to the negative then carefully touch each probe the two contacts in the connector connected to the fan. (DO NOT APPLY POWER TO THE SIDE LEADING TO THE ECU! You can severely damage your ECU.)
    After you have successfully applied power and the fan has not come on then it's probably a bad fan but i would take it to a mechanic to double check. If the fan dies come on then the problem is either in the wires leading to the ECU or in the fan controller in the ECU. Again, you can take it to a mechanic to double check or just buy the parts
    NOTE: Things that can damage your fan...
    Driving in deep water or pressure washing can allow water to enter the fan motor or connector causing a short.
    Driving in mud or collecting excessive mud in the fan or radiator can cause the fan to seize. If the fan tries to start and is packed with mud it will burn up the motor.
    If the wires are not properly secured to the frame, vibration can cause the wires to break or short.
    Hope this helps, good luck!
  3. Kika Wai'Alae

    Kika Wai'Alae Kika SXS Nation Rookie

    Sep 16, 2020
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    How do I test the sensor?

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