For 1990-2009 cars

### Removal Procedure

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the engine cooling system to below the level of the thermostat. Refer to Cooling System Draining and Filling in Engine Cooling.
3. Remove the ECT sensor electrical connector (3).
4. Remove the ECT sensor from the thermostat housing (2).

### Installation Procedure

1. Install the ECT sensor to the thermostat housing (2).
2. Install the ECT sensor electrical connector (3).
3. Refill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
4. Connect the negative battery cable.