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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P0597-P0599: Engine Coolant Thermostat >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. Loss of Coolant , and Cooling System Draining and Filling (Static) Cooling System Draining and Filling (GE 47716) 
    • If the coolant level is not correct 

      Repair as necessary

    • If the coolant level is correct 
  2. Ignition ON
  3. Verify the parameters listed below do not display Malfunction when commanding the Engine Coolant Thermostat Heater ON and OFF with a scan tool.
    • Engine Coolant Thermostat Heater Control Circuit Low Voltage Test Status
    • Engine Coolant Thermostat Heater Control Circuit Open Test Status
    • Engine Coolant Thermostat Heater Control Circuit High Voltage Test Status
    • If Malfunction is displayed 

      Refer to Circuit/System Testing.

    • If Malfunction is not displayed 
  4. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
  5. Verify the DTC does not set.
    • If any DTC sets 

      Refer to Circuit/System Testing.

    • If the DTC does not set 
  6. All OK.
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