GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

    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.

  1. Disconnect the negative battery cables.
  2. Remove the coolant surge tank. Refer to Surge Tank (Diesel) Replacement in Engine Cooling.

  3. Object Number: 555083  Size: SH
  4. Remove the harness connector (1) from the oil pressure switch (2).

  5. Object Number: 555010  Size: SH
  6. Remove the oil pressure switch (1).

Installation Procedure


    Object Number: 555076  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.

  1. Install the oil pressure switch (1) while holding the fitting (2).
  2. Tighten
    Tighten the oil pressure switch to 7.5 N·m (66 lb in).


    Object Number: 555096  Size: SH
  3. Install the harness connector (1) onto the oil pressure switch (2).
  4. Install the coolant surge tank. Refer to Surge Tank (Diesel) Replacement in Engine Cooling.
  5. Connect the negative battery cables.