Volkswagen Golf/Jetta/Cabriole 1990-1999

Electric Fan Switch

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The electric fan switch, mounted in the radiator, supplies power to the fan (via relay) when the coolant reaches a certain temperature.

TESTING



Operation of the cooling fan is dependent on several factors, which include proper thermostat operation, A/C operation, and other switches, including the after-run thermoswitch. Before testing the radiator-mounted electric fan switch, verify that the cooling system is functioning properly, and that all electrical connections and wires are intact.


CAUTION
Keep clear of the radiator fan blades. The fan can operate at any time.

  1. Unplug the electrical harness connector from the radiator fan switch.
  2.  
  3. Using a suitable jumper wire, connect the red terminal on the harness connector to the red/white wire. The radiator fan should operate at low speed.
  4.  
  5. Using a suitable jumper wire, connect the red terminal on the harness connector to the red/black wire. The radiator fan should operate at high speed.
  6.  
  7. If the radiator fan operates properly at both speeds, the radiator fan switch is faulty and should be replaced.
  8.  
  9. If the radiator fan does not operate, check the radiator fan wiring circuit for broken terminals, blown fuses, cut wires, etc. Refer to for more information.
  10.  

REMOVAL & INSTALLATION



Fox
  1. Raise and safely support the front of the vehicle on jackstands.
  2.  
  3. Remove the coolant reservoir cap to ensure there is no pressure in the cooling system.
  4.  
  5. Disconnect the harness connector from the sensor.
  6.  


NOTE
If the switch is being replaced, draining of the cooling system can be eliminated by having a new switch ready at the time of removal. A small amount of coolant will be lost, but refilling the system will not be necessary. Alternately, draining of the cooling system will be necessary for replacement of the fan switch.

  1. Place a drain receptacle underneath the switch.
  2.  
  3. Loosen the switch with a wrench until it can be turned by hand.
  4.  
  5. While pushing inward, unscrew the switch until the threads are free. Make sure to push inward on the switch with force; the pressure of the coolant will push outward. Keep a firm grip on the switch.
  6.  
  7. With the new switch (and new gasket placed on the switch) in your opposite hand, pull the old switch away from the radiator as quickly as possible while positioning the new switch in its place. Do this as fast as possible to prevent coolant from escaping from the radiator. Once positioned, screw the new switch into the radiator quickly to prevent coolant loss.
  8.  
  9. Tighten the switch to 18-26 ft. lbs. (25-35 Nm).
  10.  
  11. Plug the harness connector into the switch.
  12.  
  13. Lower the vehicle from the jackstands.
  14.  
  15. Adjust the level of the cooling system as necessary.
  16.  

All others
  1. Raise and safely support the front of the vehicle on jackstands.
  2.  
  3. If applicable, remove the lower splash shield to access the switch.
  4.  
  5. Remove the coolant reservoir cap to ensure there is no pressure in the cooling system.
  6.  
  7. Disconnect the harness connector from the sensor.
  8.  


NOTE
If the switch is being replaced, draining of the cooling system can be eliminated by having a new switch ready at the time of removal. A small amount of coolant will be lost, but refilling the system will not be necessary. Alternately, complete draining of the cooling system will be necessary for replacement of the fan switch.

  1. Place a drain receptacle underneath the switch.
  2.  
  3. Loosen the switch with a wrench until it can be turned by hand.
  4.  
  5. While pushing inward, unscrew the switch until the threads are free. Make sure to push inward on the switch with force; the pressure of the coolant will push outward. Keep a firm grip on the switch.
  6.  
  7. With the new switch (and new gasket placed on the switch) in your opposite hand, pull the old switch away from the radiator as quickly as possible while positioning the new switch in its place. Do this as fast as possible to prevent coolant from escaping from the radiator. Once positioned, screw the new switch into the radiator quickly to prevent coolant loss.
  8.  
  9. Tighten the switch to 18-26 ft. lbs. (25-35 Nm).
  10.  
  11. Plug the harness connector into the switch.
  12.  
  13. As applicable, install the lower splash shield.
  14.  
  15. Lower the vehicle from the jackstands.
  16.  
  17. Adjust the level of the cooling system as necessary.
  18.  



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Fig.



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Fig.

 
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