Volvo MD2010 Workshop Manual page 60

Cooling system
Replenishment of refrigerant
Flush the cooling system before filling up with re-
frigerant.
Close all the drain points and fill up with refrigerant to
the correct level. See next page.
Filling should be done with an idle engine. The en-
gine must not be started before the system is vented
and completely filled. If a heater unit is connected to the
engine's cooling system the heat control valve must be
fully opened and the unit vented during filling.
Check hoses and connections and seal any leaks.
Note: Fill the system slowly! Filling should not be
done too quickly or else air pockets can form in the sys-
tem. The air should be allowed to flow out through the
filling opening. Check the engine coolant level after run-
ning the engine for some time. Top up coolant if re-
quired.
0
Check the engine coolant level
WARNING! Do not open the engine coolant
system filler cap when the engine is still hot ex-
cept in an emergency Steam or hot coolant may
spray out.
Turn the filler cap to the first stop and let any pressure
escape from the system before removing the cap. Top
up coolant if necessary. For MD2O10-204OA/B the level
must be just under the neck of the filler opening and for
MD2O10-2040C between the lower edge of the neck of
the filler opening and the level spur (1). Reinstall the fill-
er cap.
If a separate expansion tank is installed (optional extra)
the level should be between the MAX and MIN marks.
MD 2010-2040A/B
Refrigerant level
6 4
ft
v
l
I N
MD 2010-2040C
Refrigerant level
Refrigerant temperature too low
If the refrigerant temperature is too low this may be be-
cause of:
- Defective thermostat.
- Defective temperature sensor or instrument.
Refrigerant temperature too high
If the refrigerant temperature is too high this may be be-
cause of:
Blocked sea water inlet or sea water filter.
Defective pump wheel in the sea water pump.
Too low refrigerant level, air in the fresh water sys-
tem.
Slipping or burst belt for the circulation pump.
Defective thermostat, temperature sensor or instru-
ment.
Blocked cooling system.
I ncorrectly set injection pump, i.e. injection angle.
Refrigerant loss
There are two types of refrigerant loss:
- Refrigerant loss when running.
- Refrigerant after stopping with a hot engine.
Refrigerant loss when running may be because the
cooling system is not tight or because air or combustion
gases have been forced into the system.