Filling Procedure

NOTE: Do not add cold water to the cooling system with the engine at or above operating temperature. Adding cold water causes rapid cooling, resulting in possible engine damage.

NOTE: Do not use a solution stronger than 70 percent antifreeze. Pure antifreeze can freeze at -22°C (-8°F).

Ensure that the radiator drain cock is closed.
Inspect the strength of the old coolant, before attempting to reuse.
When you need additional antifreeze solution:
1. 3.1. For coolant use Dex-Cool® orange-colored silicate free coolant.
2. 3.2. Pre-mix Dex-Cool® at a ratio of 50/50 with clean, drinkable water.
Place a large mouth funnel in the radiator fill opening.

Fig 1: Radiator Drain Cock & Tube
Courtesy of GENERAL MOTORS CORP.
Slowly add the coolant mixture.
Fill to 1/2 inch below the radiator fill opening.
Start the engine.
As the cooling system warms up and the thermostat opens, the coolant level will drop.
Add coolant until the level is up to the radiator fill opening.
- Do not spill the coolant onto the exhaust system or other hot engine parts.
- Under some conditions, Dex-Cool® is combustible.
Replace the radiator filler cap.
Inspect the level in the coolant recovery reservoir, add coolant if needed.
Inspect the cooling system for leaks.

Fig 2: Coolant Recovery Reservoir
Courtesy of GENERAL MOTORS CORP.