74
Fault Finding
CHART D2—Coolant over temperature
Cause
Remedy
Incorrect coolant level. Check the level.
Ensure low level is not a result of a coolant leak.
Refer to Chart D1.
Radiator matrix blocked with dirt or chaff. Clean radiator matrix.
Air flow to the radiator restricted Clean the mesh grill on the bonnet.
Check/repair the fan shroud, anti recirculation sealing.
Check fan blades replace if necessary.
Coolant pump or fan drive belts loose. Check/correct the belt tension.
Radiator hose collapsed, restricted or
leaking.
Check/replace hose.
Oil level over full. Check oil level.
Cooling system pressure cap incorrect or
faulty.
Check/replace cap.
Over concentration of antifreeze. Remove some of the coolant from the system and replace with
water.
Temperature gauge sensor faulty. Verify that the gauge and temperature sensor are correct.
Thermostat faulty, incorrect or missing. Check/replace thermostat.
Air or combustion gasses in the cooling
system.
Make sure the fill rate is not exceeded and the correct vented
thermostat is installed.
If aeration is continued check for a compression leak through the
head gasket.
Coolant pump faulty. Check routing and operation of vent line.
Vent line from engine and or radiator
blocked or incorrectly routed. (sudden
overheating).
Check routing and operation of vent line.
Cooling passages in radiator, cylinder head,
head gasket or block blocked.
Flush the system and fill with clean coolant.
Fuel inject pump timing incorrect. If the pump has recently been removed and replaced the timing
could be incorrect if the correct removal procedures were not
followed.
The timing can only be checked by a FIE specialist using the
correct equipment.
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