A charge air cooler includes a plurality of plate assemblies. Each of the plate assemblies includes a unitary first plate and a unitary second plate. The first plate and the second plate each have a channel forming surface. The channel forming surface of the first plate cooperating with the channel forming surface of the second plate to form a first flow channel for receiving a first coolant and a second flow channel for receiving a second coolant. A plurality of fins is interposed between the plate assemblies.