B5.9G, B5.9LPG, B Gas Plus, B LPG Plus – Intake Manifold Air Temperature Above Specification

Symptom Tree  

Fan drive belt or water pump belt is broken

Check the fan drive belt and water pump belt. Replace the belts if necessary. Refer to Procedure 103-002 (Drive Belts) in Section 6.


Cold weather radiator cover or winterfront is closed

Open the cold weather radiator cover or the winterfront. Maintain a minimum of 387 cm2 [60 in2] of opening at all times. Refer to Procedure 101-004 (Cold Weather Starting) in Section 1.


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 the manufacturer’s instructions.


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 Procedure 010-027 (Charge-Air Cooler) in Section 5.


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 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.

Contact a Cummins Authorized Repair Facility

Last Modified:  15-Feb-2005