Circuit/System Testing

Inspect the engine cooling system for the following:

• Low engine coolant level or engine overheating condition
• Damage, restrictions, or leaks
• Contaminated engine coolant
• Damage, restricted, or leaking EGR cooler pipes and hoses-Refer to Symptoms - Engine Cooling .
  • If the engine cooling system, pipes and hoses are OK, replace the EGR cooler and gaskets.