Operators Manual

Table Of Contents
NOTICE: Clean at moderate air pressures only to avoid damaging the
radiator grille fins.
2. Remove the debris by blowing them through with compressed air or
spraying them out with water. Work from the rear of the radiator (in the
opposite direction of the normal cooling air flow).
3. Drain the coolant when the engine is cold. Refer to section "Cooling System
Drain Procedure". For detailed procedures, see the vehicle/chassis
maintenance manual. For types of coolant, Refer to section "Coolant
Selections and Maintenance" for the listing of required intervals using the
recommended coolants.
4. If the HVAC unit is connected to the cooling system, open the regulating
valves all the way.
5. Fill the cooling system with a 5% solution (1.6 ounces per quart [50 grams
per liter] of water) of a mildly alkaline cleaning agent. Refer to section
"Coolant Selections and Maintenance".
6. Run the engine at moderate speed until the thermostat starts to open. The
thermostat starts to open at 88°C (190°F) and is fully open at 95°C (203°F).
Then run it for about five minutes longer. Shut down the engine and allow it
to cool to approximately 50°C (112°F).
7. Drain all the cleaning solution.
8. Flush the cleaning solution from the cooling system.
a. Immediately after draining the cleaning solution, flush the system
with clean water.
b. Once the clean water has drained, fill the system again with clean
water.
c. Run the engine at moderate speed until the thermostat starts to open.
The thermostat starts to open at 88°C (190°F) and is fully open at
95°C (203°F). Then run it for about five minutes longer. Shut down
the engine and allow it to cool to approximately 50°C (112°F).
d. Drain the hot water.
9. Fill the cooling system with new coolant. For detailed procedures, see the
vehicle/chassis maintenance manual. For types of coolant, Refer to section
"Coolant Selections and Maintenance" for the listing of required intervals
using the recommended coolants.
Coolant Selections and Maintenance
Coolant Selections and Maintenance
This section covers selection of the required coolant for the engine.
How to Procedures
170 All information subject to change without notice.
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