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TROUBLESHOOTING
Possible causes
Belt
Water pump
Thermostat
Radiator
Automatic cooling fan
coupling
Oil cooler
Cylinder head
Poorly airtight pressure cap
Insufficient coolant amount, contaminated coolant
Clogged or scaled coolant passage
Incorrectly connected hoses
Excessively low exterior temperature
Exhaust gas recircula-
tion related
Air compressor
Loose or damaged
Excessive tension
Oil on belt
Incorrectly mounted water pump
Defective gasket
Defective bearing unit
Defective impeller
Defective unit seal
Fit of bearing unit 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)
Leakage from coolant temperature sensor
Clogged core
Cracked core and/or separation in welds
Defective bearing
Damaged bimetal
Contaminated bimetal
Silicon oil leakage
Incorrectly mounted oil cooler
Defective gasket
Incorrectly mounted cylinder head
Defective gasket
Defective gasket
Incorrectly mounted exhaust gas recirculation piping
Defective gasket
Incorrectly mounted water pipe
Symptoms
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
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O
O
O
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O
O
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O
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O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
14
Reference Gr
Gr12
Gr11
Gr17
Gr11
14-5
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Table of Contents
Troubleshooting
