Download No External Coolant Leaks 03 F-350 Super Duty 6.0L – Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Loss of engine coolant, and smokes out the tailpipe. No external coolant leaks. 1. If the engine does not appear to be burning the coolant, suspect a leaking Exhaust Gas Recirculation (EGR) cooler. 2. Remove the EGR valve from the intake. Pressurize the cooling system and lift the rear end of the vehicle. Look for any coolant to puddle in the intake where the EGR mounts. If any coolant is seen, replace the EGR cooler. 3. If no leaks are seen with the EGR removed, drain the coolant level down and pressurize the cooling system. Then with a stethoscope and long hose, listen for air in the exhaust or in the intake where the EGR mounts. If present, again replace the EGR cooler. Exhaust Gas Recirculation (EGR) Cooler NOTE: refer to Ford Technical Service Bulletin (TSB) 09-8-3 for tips on addressing cooling system problems. It is generally recommended to also replace the oil cooler heat exchanger if an EGR cooler failure has occurred.