Thermostat Bypass Pipes Replacement. Buick GL7 (Export) 2000

For 1990-2009 cars

### 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. Remove the thermostat bypass pipe to throttle body nut (2).
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. 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. Install the thermostat bypass pipe hose.
4. Install the thermostat bypass pipe hose clamp (5).
5. Install the thermostat bypass pipe bolt (4).

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).

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. Install the thermostat bypass pipe to throttle body nut (2).

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 .