GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Terraza Ext. 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure
  1. Engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Remove the air intake duct. Refer to Air Cleaner Inlet Duct Replacement .

    3. Object Number: 1087791 Size: SH
  3. Disconnect the ECT sensor harness connector.
  4. Remove the ECT sensor.

Installation Procedure

    Important: Tap out sensor mounting hole in engine head to remove any thread sealant residue. Clean any sealant residue from old sensor and apply RTV sealant to threads if old sensor is going to be reused.


    Object Number: 1087791 Size: SH
  1. Apply thread sealant GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to sensor threads.

    2. Notice: Refer to Component Fastener Tightening Notice in the Preface section.

  2. Install the ECT sensor.

    3. Tighten
    Tighten the engine coolant temperature sensor to 23 N·m (17 lb ft).

  3. Connect the ECT sensor harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
  4. Fill engine coolant to proper level. Refer to Cooling System Draining and Filling in Engine Cooling.
  5. Install the air intake duct. Refer to Air Cleaner Inlet Duct Replacement .