Maintenance
89
C2500CB-OM-EN-16
Flushing the Cooling System:
1. Drain the system as described under ‘Draining the Cooling System’.
2. Fill the radiator with clean clear water then refit the radiator cap securely.
3. Run the engine for 5 minutes.
4. Wait until the radiator is cool enough to touch.
5. Remove the radiator cap, top the radiator up to full again then refit the radiator
cap securely.
6. If the truck has a cabin heater fitted, turn the temperature control knob to hot.
7. Run the engine for 15 minutes.
8. Watch the temperature gauge while the engine is running. If the needle moves
into the red area, switch the engine off immediately.
9. Wait until the radiator is cool enough to touch then drain the system as
described under ‘Draining the Cooling System’.
10. Repeat steps 2-7 using a solution of clean clear water (85%) mixed with the
new coolant concentrate (15%) that is going to be used.
11. Flush out the coolant bottle.
A coolant system flushing solution may be used to remove scale and other
deposits if required.
Filling the Cooling System:
1. Drain and flush the system as described under ‘Draining the Cooling System’
and ‘Flushing the Cooling System’.
2. Remove the cap from the top of the radiator. The radiator must be cool
enough to touch before removing the cap.
3. Turn the cap anticlockwise gradually to release any pressure before removing.
4. Fill with the specified coolant concentrate mixed with clean clear water (50%
coolant concentrate to 50% water) up to the bottom of the radiator filler neck.
5. Fill the coolant bottle to half way between the full and low level marks with the
same mixture.
6. If the truck has a cabin heater fitted, turn the temperature control knob to hot.
7. Run the engine for 5 minutes.
8. Wait until the radiator is cool enough to touch.
9. Remove the radiator cap, top the radiator up to full again then refit the radiator
cap securely.
10. Run the engine up to operating temperature then switch off the engine and
wait until the radiator is cool enough to touch.
11. Check the coolant level in the radiator and top up to the bottom of the filler
neck if necessary. Top up the coolant bottle also if required.
Approximate Coolant System Capacity = 14 litres/14.8 quarts
