MBE 900 OPERATOR'S GUIDE All information subject to change without notice. (Rev. 04/08) 51 DDC-SVC-MAN-0055 04/08 Copyright © 2008 DETROIT DIESEL CORPORATION Problem—The Coolant Temperature Is Below Normal Cause Remedy The coolant temperature gauge and/or sensor is not reading correctly. Bring the vehicle to an authorized dealer for service. The thermostat is damaged. Have an authorized dealer replace the thermostat. The fan is not operating properly. Bring the vehicle to an authorized dealer and have the fan hub checked. Bring the vehicle to an authorized dealer and have the parameter settings reprogrammed in the DDEC-ECU or DDEC-VCU.
Problem—The Cooling System Is Losing Coolant Cause Remedy There is an external coolant leak. Repair the leaking component. The radiator cap is leaking. Replace the radiator cap. The air compressor head is damaged. Have an authorized dealer replace the air compressor. The cylinder head gasket is leaking. Have an authorized dealer replace the head gasket. Top tank is leaking. Bring the vehicle to an authorized dealer. EGR system has an internal leak. Bring the vehicle to an authorized dealer.