Caution! Replace the coolant temperature gauge sensor on a cold engine.
Caution! Avoid contact with coolant on clothing or vehicle paintwork. Otherwise, rinse the surface with plenty of water.
Caution! Collect and dispose of drained coolant.
Replacing the sensor on cars manufactured before 2001
Drain the coolant.
Figure 4.20. Location of the coolant temperature sensor electrical connector
Disconnect the electrical connector from the coolant temperature gauge sensor (figure 4.20).
Use a wrench to remove the coolant temperature gauge sensor.
Screw in the new sensor. Do not apply sealant to the sensor threads, as this may disrupt the sensor's electrical contact with the vehicle's ground.
Connect the electrical connector to the sensor.
Fill with coolant.
Start the engine and check for leaks.
Replacing the sensor on cars produced since 2001
On vehicles produced since 2001, the coolant temperature gauge sensor is an integral part of the coolant temperature sensor used by the engine management system and cannot be replaced separately.
(The original source is located on the website: «ToyotaMAN»)