GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2004 🢒 VUE - FWD 🢒 Engine 🢒 Engine Controls - 3.5L (L66) 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure

    Object Number: 1237580 Size: SH
  1. Turn ignition OFF.

    2. Important: Engine coolant must be drained below the level of the engine coolant temperature sensor (ECT) sensor. Refer to Cooling System Draining and Filling .

  2. Disconnect the ECT sensor harness connector.
  3. Remove the ECT.

Installation Procedure

    Object Number: 1237580 Size: SH

    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.

  1. Apply thread sealant SA P/N 21485277 Loctite 242® Threadlocker (or equivalent) to sensor threads.

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

  2. Install the ECT sensor with a new O-ring.

    3. Tighten
    Tighten the engine coolant temperature sensor to 18 N·m (13 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 .