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Circuit/System Verification

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTC P0480 or P0481 is set, diagnose that DTCs first.
  2. Observe the engine coolant level. The engine coolant level should be within the operating range. Refer to Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac-N-Fill) .
  3. Ensure that the vehicle has the correct engine coolant with correct concentration and is not old, contaminated, or contains additives. Refer to Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac-N-Fill) .
  4. Inspect the cooling system for the following:
    • Leaks
    • Kinked or pinched hoses, especially at the radiator
    • Loose, missing, or damaged radiator air seals or deflectors
    • Air flow obstructions or bent fins at the radiator or the A/C condenser-Refer to Symptoms - Engine Cooling .
    5. NOTE:

    A short delay may occur before the ECM changes the cooling fan speed.

  5. Command the cooling fans ON and OFF with a scan tool. The engine cooling fans should turn ON and OFF with each command.
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