For 1990-2009 cars

1. Apply sealer GM P/N 12345739 or equivalent to the area of the oil level indicator tube that goes into the engine block.
2. Install the oil level indicator and oil level indicator tube.
3. Install the thermostat bypass pipe.
4. Install the thermostat bypass pipe hose.
5. Install the thermostat bypass pipe hose clamps.

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.

6. Install the thermostat bypass pipe to engine front cover bolt.

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

7. Install the thermostat bypass pipe to cylinder head nut.

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

8. Install the thermostat bypass pipe to throttle body hose clamps.
9. Install the thermostat bypass pipe to throttle body nut.

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