For 1990-2009 cars

Important: Use the following guidelines when servicing the cooling system or draining the cooling system for service procedures:

• | Add 2 coolant pellets, GM P/N 3634621 or an equivalent, when the cooling system is serviced or drain for service procedures.

• | The pellets must be added to the radiator or the pressurized water reservoir.

• | Crush the pellets prior to installation.

• | Do not place the pellets into a non-pressurized coolant recovery reservoir. On these systems, the pellets must be added to the radiator.

• | The sealant pellets may leave a film on the sides of the pressurized and non-pressurized water recovery reservoirs. This film is normal.

Prior to installing the water pump read the entire procedure. Pay special attention to the tightening sequence to avoid part damage and to ensure proper sealing.

1. Install the water pump cover to the coolant pump assembly.
2. Install the water pump bolts. Finger tighten the bolts.
3. Install the cover to the block bolts. Finger tighten the bolts.
4. Install the pump to chain housing nuts. Finger tighten the nuts.

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. Use the following sequence to tighten the fasteners:

5.1. | Install the pump assembly to the chain housing nuts.

Tighten
Tighten the nuts to 26 N·m (19 lb ft).

5.2. | Install the pump cover to the pump assembly.

Tighten
Tighten the bolts to 14 N·m (124 lb in).

5.3. | Install the cover to the block, bottom bolt first.

Tighten
Tighten the bolts to 26 N·m (19 lb ft).