The modular water pump can be serviced without disconnecting radiator hoses. Both the glow plug…
Power Stroke 6.0L – Cooling System Flow: Front Cover
Coolant is drawn into the inlet of the front cover and then flows from the water pump through the front cover to the crankcase.
Coolant is also routed from the front cover into the crankcase to a passage that feeds the oil cooler.
Return coolant is directed to the thermostat by the front cover. If the thermostat is open, coolant flows to the radiator to be cooled. If the thermostat is closed, coolant is returned to the water pump via a bypass circuit in the front cover.