Dodge Durango

 Service Manual

Cooling System » Diagnosis and testing
Thermostat-gas engines

ON-BOARD DIAGNOSTICS

All gasoline powered models are equipped with On-Board Diagnostics for certain cooling system components.

Refer to On-Board Diagnostics (OBD) in the Diagnosis section of this group for additional information.

If the powertrain control module (PCM) detects low engine coolant temperature, it will record a Diagnostic Trouble Code (DTC) in the PCM memory.

Do not change a thermostat for lack of heat as indicated by the instrument panel gauge or by poor heater performance unless a DTC is present. Refer to the Diagnosis section of this group for other probable causes. For other DTC numbers, refer to On-Board Diagnostics in the General Diagnosis section of Group 25, Emission Systems.

The DTC can also be accessed through the DRB scan tool. Refer to the appropriate Powertrain Diagnostic Procedures manual for diagnostic information and operation of the DRB scan tool.

On-board diagnostics (obd)

Preliminary checks

Electric cooling fan

Radiator coolant flow check

Cooling system-testing for leaks

Viscous fan drive

Accessory drive belt diagnosis

Thermostat-gas engines

Radiator cap-to-filler neck seal-pressure relief check

Radiator cap-pressure testing

Coolant-low level aeration

Cooling system-deaeration