Draining and Filling Cooling Systems

Draining and Filling Cooling System

Draining Procedure

Tools Required
^ J 26568 Coolant and Battery Tester

Caution: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.

Important: Draining the cooling system with the pressure cap installed will syphon the coolant from the overflow tank.

1. Raise and support the vehicle.
2. Place a drain pan under drain cock.
3. Open the radiator drain cock.
4. Drain the cooling system
5. Remove the coolant pressure cap.
6. If a complete engine block drain is required, remove the engine drain plugs.
7. Inspect the coolant.
8. Follow the appropriate procedure based on the condition of the coolant.
^ Normal in appearance follow the filling procedure.
^ Discolored follow the flush procedure.

Filling Procedure

Notice: The procedure below must be followed. Improper coolant level could result in a low or high coolant level condition, causing engine damage.

Notice: Refer to Fastener Notice in Service Precautions.

1. Close the radiator drain cock.
Tighten the radiator drain cock to 2 Nm (18 lb in).
2. If the engine block drain plug was removed, perform the following:
^ Apply pipe sealer to the drain plugs.
^ Install the drain plugs.
Tighten the drain plug to 22 Nm (16 lb ft).
3. Lower the vehicle.
4. Open the cooling system bleeder screws.

Important: Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water.

5. Slowly fill the cooling system with a 50/50 coolant mixture.
6. Close the cooling system bleeder screws.
7. Install the coolant pressure cap.
8. Start the engine.
9. Run the engine at 2000 - 2500 RPM until the engine reaches normal operating temperature.
10. Allow the engine to idle for 3 minutes.
11. Shut the engine off.
12. Allow the engine to cool.
13. Top off the coolant as necessary.
14. Inspect the concentration of the engine coolant, using the J 26568.
15. Rinse away any excess coolant from the engine and the engine compartment.