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ENGINE COOLANT CO-13 < PERIODIC MAINTENANCE > C D E F G H I J K L M A CO N P O The compressed air supply must be equipped with an air dryer. 7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is full of coolant, close the ball valve. This will purge any air trapped in the refill hose. 8. Continue to draw the vacuum until the gauge reaches 28 inches of vacuum. The gauge may not reach 28 inches in high altitude locations. Refer to the following table for expected vacuum read- ings. 9. When the vacuum gauge has reached the specified amount, disconnect the air hose and wait 20 seconds to see if the system loses any vacuum. If the vacuum level drops, perform any necessary repairs to the system and repeat steps 6 - 8 to bring the vacuum to the specified amount. Recheck for any leaks. 10. Place the coolant container (with the refill hose inserted) at the same level as the top of the radiator. Then open the ball valve on the refill hose so the coolant will be drawn up to fill the cooling system. The cooling system is full when the vacuum gauge reads zero. CAUTION: Do not allow the coolant container to get too low when filling, to avoid air from being drawn into the cooling system. 11. Remove the Tool from the radiator neck opening and install the radiator cap. and top up the system as necessary before installing the vented reservoir cap. 14. Install the engine under cover or skid plate. Refer to EXT-15, "Removal and Installation" FLUSHING COOLING SYSTEM 1. Drain the water from the engine cooling system. Refer to CO-11, "Changing Engine Coolant" 2. Fill the radiator and the reservoir tank (to the “MAX” line), with water. Reinstall the radiator cap and leave the vented reservoir cap off. 3. Run the engine until it reaches normal operating temperature. CO-11, "Changing Engine Coolant" 7. Repeat steps 2 through 6 until clear water begins to drain from the radiator. Altitude above sea level Vacuum gauge reading 0 - 100 m (328 ft) : 28 inches of vacuum 300 m (984 ft) : 27 inches of vacuum 500 m (1,641 ft) : 26 inches of vacuum 1,000 m (3,281 ft) : 24 - 25 inches of vacuum LLIA0057E |