How it works and about Reverse flow:
Typically most radiators work like this, the hot water from in the engine is pumped by the water pump by pushing cooling water/antifreeze into the water jackets of the block and the cylinder head, to the thermostat, when the thermostat is open the pump makes the pressure to circulate the water into the radiator inlet tank, the hot water then goes through a series of tubes to another tank that has an outlet from there it is sucked into the water pump, then back into the engine.
There are different arrangements of how radiators work, most newer vehicles today have crossflow radiators water goes into the inlet tank then thru the tubes to the other side to the outlet tank, typically older vehicles had a top and bottom arrangement, FC-170 has a top inlet tank with the water being cooled as it goes down the tubes to the lower outlet tank.
The FC-150 is unusual but it works in the same principle, it has an upper tank that is divided in half with a baffle that has an inlet on one side to take in the hot water, that allows the hot water to go down half of the tubes to the bottom tank that has no outlets, the water is partially cooled, by going thru the first half of tubes, this water fills the whole bottom tank, then goes up the empty tubes and is cooled again as it goes back up to the upper tank on the outlet side.
It is sort of, kind of a reverse flow, double pass on the air flow.
Like Craig wrote this sounds better than it works because there is the same amount of cooling water and the same amount of fan pressure creating the same amount of air volume passing the same amount of tubes.
On most other vehicles the fan is bolted to a water pump (On the front of the crank on an FC-170), the air is sucked thru the radiator thus cooling the water in the tubes.
On the FC-150 the the fan is stationary and instead of sucking air thru the tubes, it is front mounted turning in reverse and the air blows thru the tubes of the radiator.
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