A Series Diesel Engine Troubleshooting Logic 36
Coolant Loss
Cause
Correction
Radiator or Cab Heater Leaking
Visually Inspect the Radiator Heater,
Hoses and Connections to Locate the
Leak.
OK
If Oil is Present in the Coolant, Check for a
Transmission or Lube Oil Cooler Leak.
External Engine Leak
Visually Inspect the Engine and
Components for Seal or Gasket Leaks.
OK
Overheating or Leaking
Compression Gases Resulting in
Loss Through the Radiator
Overflow
Review the Operation for Overheating and
Low Power. Refer to Troubleshooting
Logic for Coolant Temperature Above
Normal.
OK
If Equipped, Transmission Cooler
Leak
Check for Mixing of Coolant and
Transmission Flood.
Refer to Page 57, 62
OK
If Equipped with a Water Cooled
Air Compressor, Leaking Head or
Head Gasket
Look for Coolant in the Oil. Check/Replace
Head or Gasket. Refer to the Equipment
Manufacturer’s Procedures.
OK
(Continued)
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