M11 Series Engines – Intake Manifold Air Temperature Above Specification

Symptom Tree  t096

This is symptom tree t096
Cause Correction

Intake manifold temperature sensor is malfunctioning

Check the intake manifold temperature sensor. Refer to Procedure 019-059 in the Troubleshooting and Repair Manual for CELECT™ Plus Systems, Bulletin 3666130, or the Troubleshooting and Repair Manual for CELECT™ Systems, Bulletin 3666084.


Intake manifold temperature gauge is malfunctioning, if equipped

Test the temperature gauge. Refer to the OEM service manual.


Vehicle speed is too low for adequate cooling with high engine load

Reduce the engine load. Increase the engine (fan) rpm by downshifting.


Radiator shutters are not opening completely, or the shutterstat setting is wrong

Inspect the radiator shutters. Repair or replace if necessary. Check the shutterstat setting. Refer to Procedure 008-049.


Cold weather radiator cover or winterfront is closed

Open the cold weather radiator cover or the winterfront. Maintain a minimum of 784 cm2 [122 in2] or approximately 28 x 28 cm [11 x 11 in] of opening at all times. Refer to Operation of Diesel Engines in Cold Climates, Bulletin 3379009.


Charge air cooler fins, radiator fins, or air conditioner condenser fins are damaged or obstructed with debris

Inspect the charge air cooler, air conditioner condenser, and radiator fins. Clean, if necessary. Refer to Procedures 010-027 and 008-042.


Fan shroud is damaged or missing or the air recirculation baffles are damaged or missing

Inspect the shroud and the recirculation baffles. Repair, replace, or install, if necessary. Refer to Procedures 008-038 and the OEM service manual.


Fan drive belt is loose

Check the belt tension and tighten if necessary. Refer to Procedure 008-002.


Fan drive or fan controls are malfunctioning

Check the fan drive and controls. Refer to Procedure 008-024, 008-025, 008-026, 008-027, or 008-028.


Fan is not an adequate size for the application

Verify that the fan is the correct size. Refer to the engine and OEM specifications.

Last Modified:  14-Jan-2004