GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 2WD 🢒 Engine 🢒 Engine Controls and Fuel - 4.3L 🢒 Turbocharger Coolant Bypass Valve Replacement

Removal Procedure

    Object Number: 1874052 Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  2. Drain the cooling system. Refer to Cooling System Draining and Filling.
  3. Reposition the coolant inlet hose clamp.
  4. Disconnect the turbocharger coolant inlet hose from the turbocharger bypass valve.

    5. Object Number: 687052 Size: SH
  5. Remove the turbocharger bypass valve and washer.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 687052 Size: SH
  1. Install the turbocharger bypass valve and washer.

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


    Object Number: 1874052 Size: SH
  2. Connect the turbocharger coolant inlet hose to the turbocharger bypass valve.
  3. Position the coolant inlet hose clamp.
  4. Fill the cooling system. Refer to Cooling System Draining and Filling.
  5. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.