System Operation

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

The secondary cooling system uses coolant flowing in a circuit separate from the primary engine cooling system. This system cools the fuel and the air charge entering the engine. A secondary engine-driven coolant pump provides for coolant flow. A secondary radiator is mounted in front of the primary engine cooling system radiator. A thermostat mounted on LH side of the secondary radiator, operates to regulate the temperature of the coolant flowing to the various components.

The coolant flows from the degas bottle to the coolant pump. The coolant pump delivers the coolant to the tank attached to the LH side of the radiator, via a hose and tube assembly.

The thermostat located the LH side of the radiator controls coolant flow to the CAC and the fuel cooler. When the thermostat is closed, coolant flows from the top tank on the LH side of the engine to the thermostat housing, and then out of the thermostat housing via a single hose. A "Y" connection allows the coolant to flow through separate hoses to the CAC and the fuel cooler. When the thermostat is opened the coolant entering the thermostat housing from the upper tank is blocked, and the coolant flows through the radiator before flowing to the CAC and the fuel cooler. The coolant flows from the CAC and the fuel cooler via separate hoses to a "Y" connection, and then via a single hose to the degas bottle.