System Operation

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

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 radiator is divided horizontally into two separate sections, the top section comprising approximately two-thirds of the radiator and approximately two-thirds of the tank attached to the LH side of the radiator. The lower one-third of the radiator and the lower one-third of the tank attached to the LH side of the radiator comprise the lower section. The tank attached to the RH side of the radiator connects the two sections.

Two thermostats control the coolant flow through the radiator and have different opening temperatures. Refer to SPECIFICATIONS for thermostat opening temperatures.

The thermostat on the RH side of the radiator controls coolant flow to the transmission fluid cooler and the EGR cooler. When the thermostat is closed, coolant is delivered to the thermostat housing via a connection to the coolant pump-to-radiator hose and tube assembly. The coolant then flows out of the thermostat housing via two separate hoses to the transmission cooler and the EGR cooler. When the thermostat is opened, the coolant connection from the coolant pump-to-radiator hose and tube assembly is blocked, and the coolant entering the tank on the LH side of the radiator is allowed to flow through the top two-thirds of the radiator and then to the transmission cooler and the EGR cooler. Separate hoses leading from the EGR cooler and the transmission cooler return the coolant to the degas bottle.

The thermostat on the LH side of the radiator controls coolant flow to the Charge Air Cooler (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 both the upper and lower sections of 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.

The fuel cooler cools the excess fuel being returned to the fuel control module from the fuel rail. For additional information, refer to FUEL CHARGING AND CONTROLS - FUEL COOLING SYSTEM .

The EGR cooler is part of the engine emissions. For additional information, refer to ENGINE EMISSION CONTROL .

The CAC is part of the air intake. For additional information, refer to INTAKE AIR DISTRIBUTION & FILTERING .

The transmission fluid cooler is part of transmission cooling. For additional information, refer to TRANSAXLE/TRANSMISSION COOLING .