Grand Cherokee 2WD V8-5.2L VIN Y (1998)
Thermostat: Testing and Inspection
ON-BOARD DIAGNOSTICS
All models are equipped with On-Board Diagnostics for certain cooling system components. If the powertrain control module (PCM) detects low
engine coolant temperature, it will record a Diagnostic Trouble Code (DTC) in the PCM memory.
The DTC can also be accessed through the ORB scan tool.