Check as follows: Visually inspect the coolant level. Examine the results. If the coolant level is within an acceptable range, check insufficient radiator air circulation; refer…
Category: DD15
Check as follows: Check belt conditions for the fan and water pump belts. If the belts are not in good conditions, replace them. If the…
Check as follows: Visually examine cooling system hoses; refer to OEM guidelines. Check for soft, deteriorated, or collapsed hoses. If cooling system hoses are not…
Check as follows: Perform coolant pressure control cap tests; refer to EPA07 DD15 Workshop Manual (DDC-SVC-MAN-0002), “Cooling System” chapter. Check the test results. If the cap passes…
Check as follows: Remove the water pump; refer to the EPA07 DD15 Workshop Manual (DDC-SVC-MAN-0002), cooling system chapter. Inspect the pulley, shaft, and impeller for damage. If…
Check as follows: Inspect thermostat for correct operation. Three different operating conditions occur due to the coolant inlet temperature: Bypass mode: When the coolant inlet temperature…
Check as follows: Test the thermo-modulated fan; refer to OEM guidelines. If the thermo-modulated fan is functioning correctly, check thermostats; refer to “11.7 Faulty Thermostat” . If…
To determine if faulty thermostats are causing low engine coolant temperature, perform the following: Inspect thermostat for correct operation. Three different operating conditions occur due…
Different engine noises that are heard when a problem occurs are listed in the following table. Type of Noise Check the Following: Whining Noise Gear…
Use this procedure to determine the cause of poor engine brake performance when no codes are present. Check as follows: Check the oil pressure…