Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Engine Coolant Temperature Sensor

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OPERATION



The engine coolant temperature sensor is usually located on the thermostat housing. This sensor controls the readings of the coolant temperature gauge in your vehicle when the ignition switch is ON .



Click image to see an enlarged view

Fig. A common engine coolant temperature gauge found on Toyota trucks

There is a needle that shows the temperature area of the engine. If the needle points in the red zone or higher (this is overheating), you should pull to the side of the road, turn your engine OFF immediately and allow it to cool.

REMOVAL & INSTALLATION



  1. Drain the coolant from the vehicle.
  2.  
  3. Disconnect the engine wiring protector from the brackets.
  4.  
  5. Disconnect the sensor wire.
  6.  
  7. Using a 19mm deep socket, remove the sensor and gasket.
  8.  

To install:

  1. Apply a thin coat of Loctite or equivalent to the switch. By hand, carefully thread the switch into the engine. If resistance is felt at all, remove the switch and inspect the threads for any damage. Continue to install the switch. Once installed, tighten to 14 ft. lbs. (20 Nm).
  2.  
  3. Connect the sensor wiring.
  4.  
  5. Install the engine wire protector to the brackets.
  6.  
  7. Refill the coolant. Start the engine and check for leaks.
  8.  

 
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