GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 GL7 (Export) 🢒 Engine 🢒 Engine Electrical 🢒 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 (2).

    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. 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 (2).

    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 .