Draining and Filling Cooling Systems

Draining and Filling Cooling System (LA1)

Tools Required
^ J26568 Coolant and Battery Fluid Tester

Draining Procedure

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.

1. Raise and support the vehicle. Refer to Vehicle Lifting.
2. Place a drain pan under the 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 block drain plug.
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

1. 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.

Close the radiator drain cock.
Tighten the radiator drain cock to 2 Nm (18 inch lbs.).
2. If the engine block drain plug was removed, perform the following:
^ Apply pipe sealant to the drain plug.
^ Install the drain plug.
Tighten the drain plug to 22 Nm (16 ft. lbs.).

3. Lower the vehicle.
4. Open the cooling system bleeder screws

5. Important: Open the cooling system bleeder screws.

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 2,000 - 2,500 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 J26568.
15. Rinse away any excess coolant from the engine and the engine compartment.