GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2002 🢒 SL1/SC1 🢒 Engine 🢒 Engine Controls - 1.9L 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure

    Object Number: 870336 Size: SH
  1. Turn the ignition OFF.

    2. Important: The engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor.

  2. Remove the air induction tubing from the throttle body to the air cleaner.
  3. Disconnect the engine coolant temperature (ECT) sensor harness connector.

    4. Important: The connector must be removed by squeezing the slides. Apply pressure to the sides gently with pliers. Do not pull on the wires.

  4. Remove the ECT sensor using a deep-well socket.

Installation Procedure

    Object Number: 870336 Size: SH

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

  1. Apply thread sealant Saturn P/N 21485277 (LOCTITE 242® Threadlocker or equivalent) to the sensor threads.

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

  2. Install the ECT sensor.

    3. Tighten
    Tighten the coolant temperature sensor to 8 N·m (71 lb in).

  3. Connect the ECT sensor harness connector. Push in the connector until a click is heard and pull back to confirm a positive engagement.
  4. Install the air induction tubing from the throttle body to the air cleaner.
  5. Fill the engine coolant to the proper level.
  6. Check for leaks.