A Series Diesel Engine Troubleshooting Logic 35
Coolant Temperature Below Normal
Cause Correction
Too Much Air Flow Across the
Radiator
Check/Repair Shutters, Fan Clutch,
Viscous Fan as Required. Refer to the
Equip. Manufacturer’s Procedure.
OK
Incorrect Thermostat, Broken
Thermostat Jiggle Pin or
Contamination in Thermostat
Check/Replace Thermostats.
Refer to Page 60, 65
OK
Temperature Sensor or Gage
Malfunctioning
Verify that the Gage and Sensor are
Accurate.
Refer to Page 61
OK
Coolant Not Flowing by
Temperature Sensor
Check/Clean Coolant Passages.
Refer to Page 55
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