Draining and Filling Cooling Systems

Draining and Filling Cooling System

Caution: As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature of the solution in the radiator without causing the solution to boil. Removal of the pressure cap while the engine is hot and pressure is high will cause the solution to boil instantaneously- possibly with explosive force-spewing the solution over the engine, fenders and the person removing the cap.

Notice: If you do not follow the procedure below, a low or high coolant level condition and/or vehicle damage could result.

1. Park the vehicle on a level surface.
2. Remove the radiator pressure cap:
3. Open the radiator drain cock.
4. Open the air bleed screw located on the thermostat housing.
5. Allow the system to drain completely.
6. Inspect the engine coolant for the following conditions:
^ Discolored - flush the cooling system.
^ Normal in appearance - continue with the next step.

Notice: Refer to Fastener Notice in Service Precautions.

7. Close the radiator drain cock.
^ Tighten the radiator drain cock to 2 Nm (18 inch lbs.).

Notice: When adding coolant, use DEX-COOL coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.
8. Fill the cooling system with a 50/50 mixture of DEX-COOL coolant and deionized water.
9. Start the engine.
10. With the pressure cap still removed, idle the engine until the normal operating temperature is reached.
11. Close the air bleed screw when coolant is visible dripping from the bleed screw.
12. With the engine still idling, add coolant to the radiator until the coolant level reaches the bottom of the fill neck.
13. Install the pressure cap.
14. Rinse away any excess coolant from the engine and engine compartment.