GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: Care must be taken when handling engine coolant temperature sensor. Damage to the engine coolant temperature sensor will affect proper operation of the fuel injection system.

Caution: Before servicing any electrical component, the ignition and start switch must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Drain the radiator coolant. Refer to Cooling System Draining and Filling in engine cooling.
  3. Disconnect the ECT sensor electrical connector.

  4. Object Number: 186069  Size: SH
  5. Using a 19 mm deep well socket and an extension remove the ECT sensor.

Installation Procedure


    Object Number: 186069  Size: SH

    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.

    Important: Care must be taken when handling engine coolant temperature sensor. Damage to the engine coolant temperature sensor will affect proper operation of the fuel injection system.

  1. Hand start the ECT Sensor into the engine.
  2. Tighten
    Tighten the ECT Sensor to 30 N·m (22 lb ft).

  3. Connect the ECT sensor electrical connector.
  4. Refill the radiator with coolant. Refer to Cooling System Draining and Filling in engine cooling.
  5. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in engine electrical.
  6. Start the engine and check for leaks.
  7. Check the coolant level.