For 1990-2009 cars

Important: Do NOT add any engine coolant supplement sealant pellets to the cooling system.

1. Park the vehicle on a level surface.
2. Remove and clean (flush) the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement .
3. Flush the engine cooling system. Follow the flushing equipment manufacturer's instructions.
4. Install the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement .
5. Add the appropriate amount of GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® to the cooling system (50% of the cooling system capacity). Refer to Engine Cooling System Specifications .
6. Fill the coolant recovery reservoir with a 1:1 DEX-COOL®/clean, drinkable water ratio.
7. Install the radiator cap (if removed). Ensure that the radiator cap arrow points toward the radiator overflow tube.

Caution: Do not remove the radiator cap while the cooling system is hot. Serious personal injury may result. Only remove the radiator cap from a cool engine.

Important: If coolant temperature indicator comes on. Turn the engine OFF immediately and allow the engine to cool. Do NOT remove the radiator cap.

8. Start the engine and allow the engine cooling fan to cycle on and off three times.

If the low coolant indicator does not turn off and the coolant level is above the Full Cold mark on the coolant recovery reservoir, refer to LOW COOLANT LEVEL Message Inoperative in Instrument Panel, Gauges and Console.

9. Turn the ignition off.
10. Allow the engine to cool.
11. Ensure that the engine coolant concentration (freeze point) is sufficient. Refer to Coolant Concentration Testing .