GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon - 4WD 🢒 Engine 🢒 Engine Cooling 🢒 Turbocharger Coolant Bypass Valve Replacement

Removal Procedure

    Object Number: 658266 Size: SH
  1. Remove the upper intake manifold sight shield using the following procedure:
    2. 1.1. Remove the retaining bolt in the front of the shield.
    1.2. Lift-up on the front of the shield.
    1.3. Lift the shield off the rear bracket.
  2. Drain the engine coolant. Refer to Cooling System Draining and Filling .

    3. Object Number: 668427 Size: SH
  3. Disconnect the turbocharger coolant hose from the turbocharger bypass valve.

    4. Object Number: 687052 Size: SH
  4. Remove the turbocharger bypass valve and sealing washer from the water outlet tube.

Installation Procedure

    Object Number: 687052 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 turbocharger bypass valve and sealing washer to the water outlet tube.

    2. Tighten
    Tighten the turbocharger bypass valve to 60 N·m (44 lb ft).


    Object Number: 668427 Size: SH
  2. Connect the turbocharger coolant hose to the turbocharger bypass valve.

    3. Object Number: 658266 Size: SH
  3. Install the upper intake manifold sight shield.

    4. Tighten
    Tighten the upper intake manifold sight shield bolt to 9 N·m (80 lb in).

  4. Fill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.