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Circuit/System Verification

WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTCs P0480, P0481, P0691, P0692, P0693, or P0694 are set, diagnose those DTCs first.
  1. Observe the engine coolant level. The engine coolant level should be within operating range. Refer to Capacities - Approximate Fluid, and Engine Coolant in the Owner's Manual.
  2. Ensure that the vehicle has the correct engine coolant, with correct concentration, and is not old, contaminated or contains additives. Refer to Recommended Fluids and Lubricants in the Owner's Manual.
  3. Inspect the cooling system for the following:
    • Cooling system leaks
    • Kinked or pinched hoses, especially at the radiator
    • Loose, missing, or damaged radiator air seals or deflectors
    • The radiator and A/C condenser for any air flow obstructions or bent fins-Refer to Symptoms - Engine Cooling .
    4. NOTE: A small delay occurs before the ECM changes the cooling fan speed.
  4. Command the cooling fans in both low and high speed.
  5. Test the thermostat for correct operation. Refer to Thermostat Diagnosis .
  6. Test the engine cooling system for overheating. Refer to Engine Overheating .
  7. Inspect the water pump and coolant flow for correct operation. Refer to Water Pump Replacement .
  8. Inspect the engine mechanical for worn/leaking/cracked cylinder heads and engine block. Refer to COOLANT IN COMBUSTION CHAMBER and COOLANT IN ENGINE OIL .
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