Cummins 3919806 Charge Air Cooler Assembly

The Cummins 3919806 charge air cooler (aftercooler) is an OEM-specification heat exchanger designed for the Cummins B-Series 5.9L turbocharged diesel engines. It reduces compressed air temperature from the turbocharger before entering the intake manifold, increasing air density for improved combustion efficiency and reduced emissions. Constructed with aluminum core and tanks for optimal thermal transfer and corrosion resistance. This unit serves as a direct replacement for Cummins part numbers 3919806, C3919806, and supersedes 3903429, 3910282, 4941638, and 5262611. It is compatible with 6BT, 6BTA, 4B3.9, and ISB6.7 engine configurations used in heavy duty trucks, construction equipment, and industrial power generation units.