For 1990-2009 cars

Drain and refill the engine cooling system every five years or 240,000 km, (150,000 miles), whichever occurs first.

### Draining Procedure

1. Park the vehicle on a level surface.
2. Remove and clean the coolant recovery reservoir.

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.

3. Remove the radiator cap when the engine is cool:

3.1. | Slowly rotate the cap counterclockwise to the detention tab. Do not press down while rotating pressure cap.

3.2. | Wait until any residual pressure (indicated by a hissing sound) is relieved.

3.3. | After all hissing stops, press down on the radiator cap and rotate the cap counterclockwise in order to remove the cap.

Important: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do NOT pour used coolant down the drain! Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound!

4. Place a drain pan under the radiator drain valve in order to collect all of the used coolant.
5. Open the radiator drain valve located at the bottom of the radiator tank. If only partial cooling system draining is required, drain enough coolant to perform the procedure.
6. Open the air bleed valve on the thermostat housing two full turns.
7. Open the air bleed valve above coolant pump two full turns.
8. Place a drain pan under the engine block drains in order to collect the used coolant.

Important: Allow the coolant to drain completely.

9. Remove both of the engine block drains.

• | The front (left) engine block drain is located between the starter motor and the engine oil filter.

• | The rear (right) engine block drain is located near the crankshaft position sensor.

### Filling Procedure

1. Reinstall the engine block drains.
2. Close the radiator drain valve.
3. Install the coolant recovery reservoir.

NOTICE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® coolant. If Coolant other than DEX-COOL® or HAVOLINE® DEX-COOL® is added to the system the engine coolant will require change sooner; at 50 000 km (30,000 mi) or 24 months.

4. Slowly add a 50/50 mixture of GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® and clean, drinkable water to the radiator until the coolant level is at the base of the radiator fill neck.
5. Wait for two minutes and recheck the level of the coolant in the radiator. If necessary, add coolant to radiator until the coolant level is at the base of the radiator fill neck.
6. Install the radiator cap.
7. Ensure that the radiator cap arrow points toward the radiator overflow tube.

Important: The air bleed valves are brass. Do NOT over-tighten the air bleed valves.

8. Close the air bleed valve above coolant pump.
9. Close the air bleed valve on the thermostat housing.
10. Fill the coolant reservoir with a 50/50 mixture of GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® and clean, drinkable water.

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.

11. 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 Engine Coolant Indicator Always On in Instrument Panel, Gauges and Console.

12. Turn the ignition off.
13. Allow the engine to cool.
14. Ensure that the engine coolant concentration (freeze point) is sufficient. Refer to Coolant Concentration Testing .

Drain and refill the engine cooling system every five years or 240,000 km, (150,000 miles), whichever occurs first.