Cooling System - Draining and Filling

DRAINING COOLING SYSTEM

WARNING: DO NOT remove the cylinder block drain plugs or loosen the radiator draincock with the system hot and under pressure. Serious burns from coolant can occur.

NOTE: DO NOT WASTE reusable coolant. If the solution is clean, drain the coolant into a clean container for reuse.

NOTE: DO NOT remove the radiator cap when draining the coolant from the reserve / overflow tank. Open the radiator draincock and when the tank is empty, remove the radiator cap. The coolant does not have to be removed from the tank unless the system is being refilled with a fresh mixture.

1. Drain the coolant from the radiator by loosening the draincock.

Fig. 19 Draining Coolant - 4.0L 6-Cylinder Engine:

2. Drain coolant from engine by removing the drain plug or coolant temperature sensor on the left side of the block.

REFILLING COOLING SYSTEM
1. Tighten the radiator draincock and the cylinder block drain plug(s).
2. Fill system using a 50/50 mixture of water and antifreeze. Fill the radiator to the top and install the radiator cap. Add sufficient coolant to the reserve/overflow tank to raise the level to the FULL mark.
3. Operate the engine with both the radiator cap and reserve/overflow tank cap in place. After the engine has reached the normal operating temperature, shut the engine off and allow it to cool.
4. Add coolant to the reserve/overflow tank as necessary Only add coolant when the engine is cold. Coolant level in a warm engine will be higher due to thermal expansion.