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Home >> Chevrolet >> 2004 >> Impala Base, 3.4 E >> Repair and Diagnosis >> External Pages >> Different car >> Section 923 (Engine Cooling System) >> Diagnostic Information and Procedures >> DTC P1258 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Malibu. 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 engine cooling system for overheating. Refer to Engine Overheating .
  3. Inspect the water pump and coolant flow for correct operation. Refer to Water Pump Cleaning and Inspection for the 3.5L engine or Water Pump Cleaning and Inspection for the 3.6L engine.
  4. Inspect the engine mechanical for worn/leaking/cracked cylinder heads or engine block. Refer to Coolant in Combustion Chamber for the 3.5L engine or Coolant in Combustion Chamber for the 3.6L engine. Also refer to Coolant in Engine Oil for the 3.5L engine or Coolant in Engine Oil for the 3.6L engine.
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