GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Skylark 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure

    Object Number: 15986 Size: SH
  1. Relieve coolant pressure.
  2. Air intake duct.

    3. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  3. Disconnect the negative battery cable.
  4. Remove the 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. Install the electrical connector.
  4. Air intake duct.
  5. Connect the negative battery cable.
  6. Start the engine.
  7. Check for leaks.
  8. Check the coolant level.

    9. Replenish as needed.