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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnostic Information and Procedures >> DTC P1258 >> Circuit/System Verification

Circuit/System Verification

  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:
    • 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 .
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