Diagnostic Test

WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE ENGINE COOLANT LEVEL AND CONDITION
WARNING:
Never open the cooling system when the engine is hot. The system is under pressure. Failure to follow these instructions can result in personal injury including extreme burns, scalding, or fatal injury. Allow the engine to cool before opening the cooling system.
1. Check the engine coolant level and condition in accordance with the Service Information.
  Is the coolant level and condition within specifications?
  
  Yes
  - Go To 2
  No
  - Inspect the vehicle for a coolant leak and add the necessary amount of coolant. Perform the POWERTRAIN VERIFICATION TEST. Refer to: 2.0L - POWERTRAIN VERIFICATION TEST .
CHECK FOR OTHER DTCS
1. Refer to the recorded DTCs.
  Are there any Engine Coolant Temperature (ECT) or Ambient Air Temperature (AAT) DTCs present?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to: 2.0L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE COOLING SYSTEM OPERATION
NOTE:
If engine coolant temperature is above 65°C (149°F), allow the engine to cool until it is below 65°C (149°F).
1. Start the engine.
2. Check for proper operation of the cooling system while the engine warms up to normal operating temperature. Check the Radiator Cap, coolant flow through the Radiator and anything that can cause a lack of system pressure or lack of coolant flow in the system.
  Were any issues found with the cooling system?
  
  Yes
  - Perform the appropriate repair in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to: 2.0L - POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Thermostat in accordance with the Service Information. Refer to: THERMOSTAT, REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to: 2.0L - POWERTRAIN VERIFICATION TEST .