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Look at the blades of the fan. They are "slanted" one way or the other. They have a given pitch. The pitch and direction of rotation determine which way the air will move when the fan is on. Now that we agree on that, let's jump. Fans associated with a vehicle radiator are supposed to move air through the radiator in the same direction as air would flow when the vehicle is moving. They act with the moving air to help it move. They do not act against it. That's not smart. Fans in front of a radiator blow back through it. Fans behind a radiator "pull" air through the radiator. Think this through and it should become clear, it should make sense. It's simple physics.

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