RAM 2500 Truck 2WD V10-8.0L VIN W MDC (1999)
Thermostat: Testing and Inspection
THERMOSTAT - GAS ENGINES
ON-BOARD DIAGNOSTICS
All gasoline powered models are equipped with On-Board Diagnostics for certain cooling system components. Refer to Powertrain Management 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 Cooling System, Testing and Inspection for other probable causes.
The DTC can also be accessed through the DRB scan tool. Refer to Powertrain Management for diagnostic information and operation of the DRB
scan tool.
