User Manual

BASIC TROUBLESHOOTING
Abnormal Coolant Temperature Symptoms and Probable Causes
Probable Causes
Above Normal
Temperature
Below Normal
Temperature
Restricted cooling system
passages
X
Restricted radiator core passages X
Slipping fan drive belts
X
Faulty temperature-control led fan X
Obstruction in front of radiator
or intercooler
X
Low coolant leve l X
Damaged hoses X
Faulty the rmostats X
Faulty water pump X
Faulty radiator pressure cap X
Air in coolant X
Thermostats not fully closed
X
Leakage around thermostat seals X
Faulty temperature-control led fan
X
120 All information subject to change without notice. (Rev. 01/04)
DDC-SVC-MAN-0058 Copyright © 2004 DETROIT DIESEL CORPORATION