Thermo Fan Had heating issues with my fse06 450 on the weekend. Thermo fan wasnt working. Have replaced relay and bypassed fan to make sure it was working. Still no luck. There would have to be a heat switch or thermostat to turn on the fan

f the engine shows signs of overheating, stop and look to see if the fan is working. With the type operated by the Connect the motor feedterminal to the live terminal onthe battery.

Check a fan motor for faults

Fan motor with the thermo-switch lead disconnected and test lead connected to the battery.Look at the battery, and take off the wiring terminals to the motor or disconnect the plug. Free the wires from clips or other fixings on the fan
A new motor is supplied without a fan, which must be refitted from the old one.The motor and fan normally come off as an assembly, but you may also have to remove the shroud and sometimes the radiator.
Separate the components. Clean the parts that are to be reused, simply by degreasing or even by repainting.
Checking the new motor When you fit a replacement motor, check it by connecting its leads directly to the battery. Be sure to connect the positive (+) and negative (-) leads to the corresponding battery terminals.Take care - the motor will kick as it starts and there will be a large spark when it is connected.
Checking the switch for faults A thermo-switch with push-on connections. The switch is threaded and has a sealing washer which must be renewed.If the fan motor is not at fault, leave the ignition switched on, take the connections off the thermo-switch and briefly touch them together.
If the fan motor now works, the switch is faulty. If it does not, check to see that there is current flowing to the switch by using a circuit tester on the feed wire to the thermoswitch.
Touch the leads together to bypass the switch.If the tester does not light, trace the lead from the thermo-switch back to its power supply; the car handbook may have a wiring diagram
A detailed drawing showing the location of electronic components and devices that are connected together in a circuit.
.If the tester lights, trace the lead from the thermo-switch through to the relay and check the terminals for tightness and cleanliness. Clean and tighten as necessary. Changing a thermo-switchThe thermo-switch is normally located in the radiator bottom tank, in the How to flush an engine radiator) until the coolant is below the level at which it is fitted. Catch the coolant in a clean container if you plan to reuse it. If a rubber cover is fitted over the back of the switch, ease it off, then disconnect the electrical connections.
The switch can now be unscrewed from its mounting point with an appropriate spanner. It may, however, be very tight, so take care not to distort the surrounding metal if it is fitted in the radiator bottom tank. Always fit a new sealing washer.
Checking the relay for faultsWith the ignition switched on, short-circuit the thermo-switch by putting a screwdriver across its two terminals; do not disconnect the leads. You may be able to hear a click from the relay as it operates. Test for current with a test lamp or circuit tester at the 'live' lead to the relay - again with the ignition switched on.
If there is current here but, when the thermo-switch is bypassed, none at the terminal for the fan-motor lead, the relay is faulty and must be replaced.
Checking the T-piece On the Datsun Cherry the thermoswitch and connections are in a T-piece on the bottom radiator hose, so look there if the switch is not on the radiator.

you changed the thermo switch and relays and it didnt fix it
did you test the fan motor itself

the fuse box cover should have a fuse layout diagram
engine cooling fan

look for a 30 amp fuse

they usually near the fan relays

is the air con cooling fan working with air con on
and engine running

they were paranoid the bike was going to over heat if they did not have control of it/ the old switch possibly gave up and they bypassed it instead of replacing it/ they were riding that bike HARD and did not want to run the risk of the self managed cooling to stop while riding.


or the cooling system was stuck on and over cooling the engine. i have myself bypassed thermo fan relays in cars for switches in the past because the relays were not working anymore for whatever reason they gave up for. i would not stress if its a switch, just make sure its working well when you go riding it and do not forget to turn it off after your done

is this the blower motor fan for you heating and A/C or the cooling fan cooling fans have a relay blower fans are fused but controlled from switches inside as well as fuses

locate the thermo sensor wich activate the fan's.Remove the plug and bridge out the two wires with only the ignition on.If the fan comes you need to replace the thermo sensor. If the fan still dont work then you have a wiring or relay problem.If the relay is faulty the same taes can be done as on the sensor. Find the relay and match the wiring colour that goes to the fan.On the relay harness you must test for two power supplies and bridge the one power supply to the fan wire.If the fan work;s and you do find two power supplies you only need to confirm if the wire from the sensor to the relay has continuity.If the wire is fine then you know that the relay is faulty.

Check the relay for your thermo fan, should be in the main fuse box under the bonnet. Often when they heat up the fault presents itself. Other than that your thermo fan might be faulty.

Sounds like you're issue will be the Cap do you have a multi meter?

The fan control thermo switch should be either "off" or "on".
Voltage should measure either +12 or 0V, depending on coolant temperature.
Replacing it should fix your problem.

the relay will be located in the power distribution box under the hood. your owners manual will tell you which one it is if it is not clearly marked

mine did the same thing, im no expert but on the top of the radiator theres a plug on the top right side. its called a thermo-switch and that makes the fan kick on around 190 or so. pull that out and replace it then she should run cooler