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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Test the thermostat for correct operation. Refer to Thermostat Diagnosis .
  2. Test the fan clutch for proper operation. Refer to Fan Clutch Diagnosis .
  3. Test the engine cooling system for overheating. Refer to Engine Overheating .
  4. Inspect the water pump and coolant flow for correct operation. Refer to Water Pump Replacement (LU3)  or Water Pump Replacement (LMF/LY2)  or Water Pump Replacement (LMM)  or Water Pump Replacement (LY6) .
  5. Inspect the engine for worn/leaking/cracked cylinder heads and engine block. Refer to Coolant in Combustion Chamber and Coolant in Engine Oil .
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