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If the AC is on constantly, the fan will be on constantly. If that's not it, it mught be the fan relay or the temperature sensor.
The cooling fan will run whenever the AC or Defroster is on. Beyond that, it will run whenever the sensor indicates that the temperature is above a set-point.
If the PC and CPU are still plugged in and the computer is turned on, a person can tell if they have an active or passive cooling system. An active cooling system allows the fan to run constantly. A passive system allows the fan to run only when there is danger of overheating.
Check the operation of the cooling fan or fans. One should run constantly with the A/C on. If it does not, check the fuse, relay, and finally the fan itself.
Answer: If you mean your radiator cooling fan, it most likely is a grounded or shorted circuit from the "cooling fan sensor" (internal) or a pinched wire. Depends on when it happened: was there any work done prior to this happening? IF not, then the sensor is most likely the issue. In this case, once you find it (normally the sensor is screwed into the bottom of the radiator), unplug one of the wires (or remove the connector) and see if the cooling fan continues to run, if the fan turns off, then replace the sensor.
Simply bypass the cooling fan thermostat .G
Depending on ambient temperature and which heater mode you have selected your A/C may be running which may in turn trigger the cooling fan. Also if the check engine light is on the fan will sometimes run because of the code set. One final possibility is the temp sensor may be reading incorrectly
Bad temp. sensor? on most ford contour cars the cooling fan only runs when the motor reaches a certain temp. this model car also has a cooling fan relay switch,if the switch is bad the fan will not run.
The electric cooling fan or cooling fan temp sensor may be faulty.
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The cooling fan generally does not run when the car is cold, but could be wired directly to the battery so that when the ignition is engaged, the fan comes on. This is not a factory modification but is often accomplished if the car tends to run hot.
If you have a problem with your cooling fan it may be an electrical problem. You don't want to drive you car in this condition because it can run hot.