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Engine Coolant Temperature Sensor: Installation

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Whenever ECT sensor is removed, coat threads with Sealer (12346004 or equivalent) before reinstallation. Install ECT sensor into engine and tighten to specification. See TORQUE SPECIFICATIONS .
  2. Reconnect harness connector to ECT sensor. Reinstall generator. Tighten generator mounting bolts to specification. Connect cable to generator positive post and tighten nut to specification. Reinstall engine lift hook. Reinstall A/C line bracket-to-engine lift hook bolt.
  3. Install a 3/8" drive breaker bar onto the drive belt tensioner. See Figure. Turn breaker bar clockwise enough to allow installation of drive belt. Install drive belt. Release tension on drive belt tensioner.
  4. Reconnect negative battery cable. Fill and bleed cooling system. See appropriate article in ENGINES.


NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
  1. Coat the ECT sensor threads with Sealer (GM P/N 12346004).
    NOTE: 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 ECT sensor. See Fig 2. Tighten the sensor to specification. See TORQUE SPECIFICATIONS .
  3. Connect the ECT sensor electrical connector (1). See Fig 1.
  4. Refill the engine coolant.
Fig 1: Removing & Installing ECT Sensor (1 Of 2)
G00256482Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing & Installing ECT Sensor (2 Of 2)
G00256483Courtesy of GENERAL MOTORS CORP.
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