Common Interference Causes
Suitable actions
Functional Disturbances
For more detailed information and further fault tracing
help, See Operator's Manual, group 30, “MID 128,
PID 110, Engine coolant temperature”. If there is a
malfunction, first check the following items:
• Check that the coolant level is between the
markings on the expansion tank (at approx.
20°C) [68 °F]. If the level in the expansion tank
is too low, top up and start the engine. If the
coolant disappears, there is internal or external
leakage.
• Check that the coolant is not contaminated. If
the coolant is contaminated, this signifies inter-
nal leakage (oil) or that the cooling system has
a blockage (deposits). Blockage in the cooling
system is caused by one or more of the follow-
ing factors:
1 The coolant has not been changed at the
specified intervals.
2 Incorrect mixture of coolant and water.
3 Contaminated water has been used.
Clogging
Is often caused by high coolant temperature, internal
or external blockage of the cooling system, or a com-
bination of both. If the cooling system is blocked, it
must be cleaned.
•
External dirt
: Check that the cooler and/or the
charge air cooler are not clogged. If you cannot
see light through at least one third, the cooler
should be removed and cleaned.
Check if there is any internal or external leakage
in the cooling system.
•
Internal contamination
: Check that the cooler
and/or the charge air cooler are not clogged.
External cleaning:
1 Remove guards as necessary, to access the
radiator.
IMPORTANT!
Take care that the radiator lamella are not dam-
aged.
A high pressure washer may under
no circum-
stances
be used!
2 Clean with water and a mild detergent.
Use a soft brush.
3 Re-install removed parts.
Internal cleaning:
• Refer to
Cooling System, Cleaning
.
Further checks
•
External and internal leakage in the cooling
system
: Check if there is leakage in the system.
•
Coolant circulation
: Check that coolant circu-
lates by letting the engine run at high speed.
Also check the expansion tank to see that cool-
ant circulates. This can be an indication of a
fault in the cooling system.
•
Thermostat
: Check thermostat function. Drain
enough coolant to allow the thermostat to be
removed. Check the thermostat; refer to
Ther-
mostat, Function Check page 293
.
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