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Louie, Technician
Category: Motorcycle
Satisfied Customers: 12281
Experience:  25+ yrs. experience
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Why would fan stop working. The engine keeps overheating. The

Customer Question

Why would fan stop working. The engine keeps overheating. The fuses are good. Thermostat ?
Submitted: 2 years ago.
Category: Motorcycle
Expert:  Louie replied 2 years ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, bear with us; re-confirm and post back with the complete model number of the motorcycle.

Still, general considerations:

  • • the thermostat regulates/controls the coolant flow but it has no direct control of the fan;
  • • the fan motor is turned on/off by a temperature sensor embedded into the radiator;
  • • in some instances, it may be a fan motor, wiring and/or connector issue;
  • • dependent on the make and model, the fan may also be controlled by a separate fuse, circuit breaker, relay and/or the main/ignition switch.

Please post back how you would want to approach this and/or should additional information be needed.

Customer: replied 2 years ago.

So how should I proceed ?

Expert:  Louie replied 2 years ago.
As posted above; " and post back with the complete model number..."
Customer: replied 2 years ago.


The only number on the paper work is the VIN

Expert:  Louie replied 2 years ago.

Appreciate the additional information; a Kymco UXV 500.

As posted above, the fan motor is controlled by a temperature switch embedded into the radiator body. This would be the primary suspect. Dependent on the version, it may have 1 or 2 terminals:

  • • if only 1 terminal, short/jump this terminal to the radiator/engine/frame ground with the ignition switch on. The fan motor should spin;
  • • if 2 terminals, short these 2 terminals together with the ignition switch on. The fan motor should spin.

If yes to either of the above, then it would confirm the temp sensor is faulty.

In some instances, it may just be a poor ground connection of the radiator.

In some others, it may be a faulty fan motor. A way to test is to directly connect the 2 wires of the fan motor to the battery to determine if it would work independently.

Please post back results / observations of the above once tried.

All other tests would require the use of a multi-meter.