GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    Notice: When adding coolant, use DEX-COOL® coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.

  1. Disconnect the negative battery cable. Refer to

    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.

    in General Information.
  2. Partially drain the coolant from the radiator. Refer to Cooling System Draining and Filling .

  3. Object Number: 70069  Size: SH
  4. Disconnect the electrical connector from the module.

  5. Object Number: 70045  Size: SH
  6. Remove the module. In order to unlock the module, lift one leg of the snap clip from the clip's locked position. Pull the module outward with a slight twisting motion.
  7. Inspect the condition of the module o-ring seal.

Installation Procedure


    Object Number: 70259  Size: SH
  1. Lubricate the o-ring seal of the module with coolant.

  2. Object Number: 70045  Size: SH
  3. Position the snap clip leg into place.
  4. Install the indicator module to the radiator.

  5. Object Number: 70069  Size: SH
  6. Connect the electrical connector to the module.
  7. Refill the coolant. Refer to Cooling System Draining and Filling .
  8. Connect the negative battery cable.
  9. Tighten
    Tighten the negative battery cable bolt to 15 N·m (11 lb ft).

    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.

  10. Start the engine. After the engine reaches normal operating temperature, check for coolant leaks.