Operation and maintenance manual

Troubleshooting Symptoms Charts B3.9, B4.5, B5.9 Industrial
Page TS-16 Section TS - Troubleshooting Symptoms
Coolant Temperature Below Normal
Cause Correction
STEP 1
Coolant temperature gauge or sensor is
malfunctioning
.............
Test the gauge and the sensor. Repair or replace,
if necessary. Refer to OEM service manual.
OK
Go To Next Step
STEP 2
Engine is operating at low ambient temperature
.............
Check the winterfront, shutters, and under-the-
hood air. Use under-the-hood intake air in cold
weather. Refer to Operation of Diesel Engines in
Cold Climates, Bulletin 3379009, and Procedure
101-004 (Cold Weather Starting) in Section 1.
OK
Go To Next Step
STEP 3
Fan drive or fan controls are malfunctioning
.............
Check the fan drive and controls. Refer to the
OEM service manual.
OK
Go To Next Step
STEP 4
Coolant temperature gauge is malfunctioning
.............
Test the temperature gauge. Repair or replace the
gauge, if necessary.
OK
Go To Next Step
STEP 5
Thermostat is not correct or is malfunctioning
.............
Check the thermostat for the correct part number
and for correct operation. Contact a Cummins
Authorized Repair Facility.
OK
Go To Next Step
STEP 6
Contact a Cummins® Authorized Repair Facility