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TROUBLESHOOTING
Possible causes
V-belt
Water pump
Thermostat
Radiator
Intercooler
Oil cooler
<For machinery>
EGR system
Oil cooler
Cylinder head
Poorly airtight pressure cap
Coolant quantity insufficient and/or coolant dirty
Coolant passages dirty and/or clogged
Hoses fitted poorly
Ambient temperature extremely low
Loose or damaged
Excessive tension
Oil on belt
Incorrectly mounted water pump
Defective gasket
Defective unit bearing
Defective impeller
Defective unit seal
Fit of unit bearing on flange and impeller too loose
Incorrectly mounted case
Defective gasket
Valve opening temperature too high
(valve remains closed)
Valve opening temperature too low (valve remains open)
Clogged core
Cracked core and/or separation in welds
Foreign matter adhered on the core
Water leaking
Defective gasket
Incorrectly mounted EGR cooler
Incorrectly mounted oil cooler
Defective gasket
Water leaking from water temperature sensor
Incorrectly mounted cylinder head
Defective gasket
Symptoms
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
14
Reference Gr
O
Gr17
Gr12
Gr11
14-5
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Table of Contents
Troubleshooting
