GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Engine 🢒 Engine Controls - 3.0L (L46) 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure
  1. Turn OFF the ignition.

    2. Object Number: 15986 Size: SH
  2. Relieve coolant pressure.
  3. Loosen the 2 air intake duct clamps and remove the air intake duct.
  4. Disconnect the ECT sensor electrical connector.
  5. Using a deep well socket and extension, remove the sensor.

Installation Procedure

    Object Number: 15986 Size: SH
  1. Coat engine coolant temperature sensor threads with sealer P/N 9985253 or equivalent.

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the sensor in the engine.

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

  3. Connect the ECT sensor electrical connector.
  4. Reinstall the air intake duct and tighten the 2 air intake duct clamps.
  5. Start the engine.
  6. Check for leaks.
  7. Check the coolant level.