To vent air during the fill process:
• Some thermostats have check balls that allow air to vent through the thermostat when closed.
• An air vent port connection, which connects to the top tank/coolant recovery tank of the cooling system, is
located next to the water outlet.
This provides adequate venting for a fill rate of 19 liters [5 gal] per minute.
NOTE: An alternate to using sodium carbonate, as outlined in this procedure, is to use Restore”‘.
Restorenl is a heavy-duty cooling system cleaner that removes corrosion products, silica gel, and other deposits.
The performance of Restore”‘ is dependent on time, temperature, and concentration levels. An extremely scaled or flow-restricted system, for example, can require higher concentrations of cleaners, higher temperatures,
longer cleaning time, or the use of Restore Plus 111 • Up to twice the recommended concentration levels of RestoreTM can be used safely. Restore Plus”‘ must be used only at its recommended concentration level. Extremely scaled or fouled systems can require more than one cleaning.
NOTE: Do not install the radiator cap. The engine is to be operated without the cap for this process.
Fill the cooling system with a mixture of sodium carbonate and water (or a commercially available equivalent) to the capacity or level stated in the OEM service manual.
NOTE: Adequate venting is provided for a maximum fill rate of 19 liters [5 gal] per minute.
Unless indicated otherwise by the OEM instructions, it is critical that all shutoff valves be returned to their open positions once the system has been refilled and the deaeration process is about to begin. This will help to make sure as much air as possible will be purged from the cooling system. See the OEM service manual for valve locations.
Wait 2 to 3 minutes without starting engine, to allow the system to naturally purge entrained air and the coolant level to stabilize.
Add plain water to bring the level back to FULL.
Turn all cab heater switches to HIGH in order to allow maximum coolant flow through heater core(s). The blower MUST be turned ON.
With the cooling system fill cap removed:
• Operate the engine at LOW Idle for 2 minutes.
• Turn off the engine and add plain water to bring the level back to FULL.
With the cooling system fill cap removed:
• Start the engine.
NOTE: After starting a cold engine, increase the engine speed (rpm) slowly to provide adequate lubrication to the bearings and to allow the oil pressure to stabilize.
Operate the engine at HIGH idle until the thermostat opens.
Allow the engine to return to LOW idle for 2 minutes before shutting it down. This allows adequate cool down of pistons, cylinders, bearings, and turbocharger components.
Turn off the engine and check the coolant level according to the OEM service manual recommendations and add, if necessary, to bring it back to the FULL level.
Install the cooling system cap.
Operate the engine for 1 to 1112 hours with the coolant temperature above 80°C [176°F).
Shut the engine off. Allow the coolant temperature to drop to 50° C [122° F) before draining the cooling system.
Drain the cooling system.
NOTE: Do not install the radiator cap.
Fill the cooling system with good quality water to the capacity or level stated in the OEM service manual.
Unless indicated otherwise by OEM instructions, it is critical that all shutoff valves be returned to their open
positions once the system has been refilled and the deaeration process is about to begin. This will help to
make sure as much air as possible will be purged from the cooling system. See the OEM service manual for valve
locations.
Wait 2 to 3 minutes, without starting the engine, to allow the system to naturally purge entrained air and the coolant
level to stabilize.
Add plain water to bring the level back to FULL.
Turn all cab heater switches to HIGH in order to allow maximum coolant flow through heater core(s). The blower
MUST be turned ON.
With the cooling system fill cap removed:
• Operate the engine at LOW Idle for 2 minutes.
• Turn off the engine and add plain water to bring the level back to FULL.
With the cooling system fill cap removed:
• Start the engine
• Operate the engine at HIGH IDLE until the thermostat opens.
NOTE: After starting a cold engine, increase the engine speed (rpm) slowly to provide adequate lubrication to the
bearings and to allow the oil pressure to stabilize.
Allow the engine to return to LOW idle for 2 minutes before shutting it down. This allows adequate cool down of
pistons, cylinders, bearings, and turbocharger components.
Shut the engine off, allow the cooling system to cool to 50° C [122°F].
Drain the cooling system.
NOTE: If the water being drained is still dirty, the system must be flushed again until the water is clean.
