The radiator fan pulls air from the environment towards the engine to cool the coolant in the radiator and the engine block. The direction of rotation depends on the orientation of the fan's blades.
Types of radiator fans
1. Push fans
They are positioned in front on the radiator and they push air from the environment (front of the car) towards the engine.
2. Pull fans
They are placed at the back of the radiator, in-between the radiator and the engine. They pull air from the environment (front of the car) through the radiator.
Both types of radiator fans direct cooler air towards the radiator (to cool the coolant) and the engine (to cool the engine block).
At times, overheating occurs because the cooling fan is not rotating in the correct direction, causing inefficient cooling.
Causes of radiator fan wrong direction of rotation
1. Wrong electrical connection of power to the fan
This has to do with interchanging the positive and negative terminals of the fan with that of the power source. If it is reversed, the fan will spin in a reverse direction.
2. Installing incorrect fan
There are different fans with different blade orientations. Sometimes, it is possible for a fan to fit into position yet have different blade orientation which makes it to blow air in the opposite direction.