Charge Air Cooler

Electrical power for the charge air coolant pump is supplied from the Powertrain Control Module (PCM) relay, located in the Engine Junction Box (EJB). When the relay is energized, it connects power from the startup battery to the charge air coolant pump. Operation of the charge air coolant pump is controlled by the PCM with a Pulse Width Modulation (PWM) signal.

When the charge air coolant pump is running, engine coolant flows from the charge air coolant pump outlet through the charge air cooler. Afterwards to the auxiliary radiator and the charge air radiator that are connected in series. From the outlet connection of the charge air radiator the engine coolant flows back to the charge air coolant pump inlet connection.