A4711405675 Genuine Detroit Diesel EGR Exhaust Gas Recirculation Cooler

Detroit Diesel EGR Cooler — What It Does

The EGR cooler on Detroit Diesel power takes exhaust gas headed back to the intake and pulls its temperature down — a gas-to-coolant heat exchanger that makes recirculation survivable for the engine and effective for emissions. It lives with exhaust heat on one side and coolant on the other, and its failure mode is the two sides meeting.

Common Symptoms of a Failing EGR Cooler

• Coolant loss with no puddle to show for it — it’s leaving through the exhaust
• White smoke, sweet-smelling, especially at start-up
• Coolant system pressurizing as combustion gases push in
• Soot plugging the cooler’s passages — EGR flow and performance faults
• Overheating as the cooler’s restriction grows

Replacement Notes

Pressure-test to confirm the diagnosis — coolers get blamed for head gaskets and vice versa — then treat the causes with the replacement: cooling system health, and the soot load that plugged the old core. Fresh gaskets and hardware, torque per the manual, a proper coolant fill and bleed, and a leak check hot before the truck rolls.

Part Number & Fitment Verification

Listed MPN: A4711405675

This listing is identified as Genuine Detroit Diesel EGR Exhaust Gas Recirculation Cooler. Match the exact part number to the removed component and confirm cooled medium and position, core capacity/dimensions, port/seal layout, pressure duty, mounting, engine/chassis application, and build date. Parts that appear similar may differ in connector keying, port location, dimensions, offset, calibration, or internal specification.

Technical information is general service guidance. Follow the OEM service manual and verify fitment by VIN, engine serial number, transmission serial number, or chassis build data as applicable before installation.