GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2000 🢒 Silhouette Ext. 🢒 Engine 🢒 Engine Cooling 🢒 Thermostat Bypass Pipes Replacement

Removal Procedure
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the spark plug wire harness from the thermostat bypass pipe.

    3. Object Number: 54419 Size: SH
  3. Remove the thermostat bypass pipe to throttle body nut.

    4. Object Number: 315719 Size: SH
  4. Remove the thermostat bypass pipe to throttle body hose clamps (1).
  5. Remove the thermostat bypass pipe to cylinder head nut (3).
  6. Remove the thermostat bypass pipe bolt (4).
  7. Remove the thermostat bypass pipe hose clamp (5).

    8. Object Number: 187083 Size: SH
  8. Remove the thermostat bypass pipe hose.
  9. Remove the thermostat bypass pipe.

Installation Procedure
  1. Apply engine coolant to the bypass pipe seal in order to ease installation.
  2. Install the thermostat bypass pipe.

    3. Object Number: 187083 Size: SH
  3. Install the thermostat bypass pipe hose.

    4. Object Number: 315719 Size: SH
  4. Install the thermostat bypass pipe hose clamp (5).

    5. 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.

  5. Install the thermostat bypass pipe bolt (4).

    6. Tighten
    Tighten the thermostat bypass pipe bolt to 11 N·m (98 lb in).

  6. Install the thermostat bypass pipe to cylinder head nut (3).

    7. Tighten
    Tighten the thermostat bypass pipe nut to 25 N·m (18 lb ft).

  7. Install the thermostat bypass pipe to throttle body hose clamps (1).

    8. Object Number: 54419 Size: SH
  8. Install the thermostat bypass pipe to throttle body nut.

    9. Tighten
    Tighten the thermostat bypass pipe nut to 25 N·m (18 lb ft).

  9. Install the spark plug wire harness to the thermostat bypass pipe.
  10. Fill the cooling system. Refer to Cooling System Draining and Filling .