For 1990-2009 cars

### Removal Procedure

Warning: Refer to Battery Disconnect Warning in the Preface section.

1. Disconnect the negative battery cable.
2. Remove the heater core cover. Refer to Heater Core Replacement.
3. Disconnect the electrical connector.
4. Remove the sensor retaining screws.
5. Remove the sensor from the heater core pipe.

### Installation Procedure

1. Install the sensor with the retaining screws and tighten.
2. Connect the electrical connector.
3. Install the heater core cover. Refer to Heater Core Replacement.
4. Connect the negative battery cable.