Refilling

CAUTION: Two sealant pellets GM P/N 3634621, or equivalent must be added to the radiator Inlet hose whenever the coolant system Is drained and refilled with fresh coolant. Failure to use the correct sealant pellets may result in premature water pump leakage. Do not add the pellets to coolant recovery bottle since this may prevent the coolant system from operating properly.

1. Check the radiator drain cock to be sure that it is closed.
2. Check the engine drain plug to be sure that it is tight.
3. Premix the antifreeze with clear water (distilled water preferred) on a 50/50 ratio.

^ If the old coolant is being used check it for 50/50 glycol/water mix and make sure that it is clean and clear.

4. Place a large top funnel in the radiator fill hole.
5. Slowly pour in the coolant. The filling may be slowed because of the thermostat being closed.
6. After the cooling system is filled to 13 mm (1/2 inch) below the fill hole, start the engine and let the cooling system warm up. When the thermostat opens, the coolant level may drop. If the level drops, add coolant until the level is up to fill the hole.
7. Replace the radiator cap.
8. Check the coolant level in the recovery reservoir. Add coolant if needed.