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There could be three reasons that the radiator fans do not come on.

  1. The fan motor itself has failed. This can be tested by connecting power directly from the negative and positive cables of the battery to the corresponding connectors on the fan wire.
  2. The temperature sensor has failed. This is located at the bottom driver's side of the radiator. The sensor is round with a large hex head. It screws directly into the radiator. You can follow the wires from the fans to the sensor.
  3. You car does not have enough coolant to fill the radiator to the level of the sensor. (This is unlikely and you would most certainly notice other problems!)
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Q: Why wont Radiator fan wont come on jetta 2001 1.8 turbo?
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