• Radiator

The radiator's task is to transfer the high temperature of the coolant to the (cooler) passing air. The engine is then supplied with the cooled coolant, which prevents it from overheating.
The radiator is mounted behind the front bumper of the car. Often there are still one condenser (for the air conditioning), a heat exchanger (for the automatic gearbox oil) and an intercooler (for cars with a turbo / compressor) also mounted in front of the radiator.

Coolant flows through the engine's coolant channels through flexible hoses to the top of the radiator. The coolant then travels a zigzagging horizontal path from the top to the bottom of the radiator. This concerns a so-called "cross flow radiator". If the coolant would flow through the radiator from top to bottom, we would speak of a “downdraft radiator”.
There are all fins between the coolant tubes of both the cross-flow and the downflow radiator. Both the coolant tubes and the fins are heated by the warm coolant. The radiator is made of thin aluminum, which has the advantage that it can heat up and cool down very quickly.
When the car is driving on the road, the wind flows between the slats. The heat from the coolant is transferred to the cooler air. This allows the coolant to cool down to tens of degrees.

When the car is stationary and there is therefore no driving wind, the electronic or viscous fan for air movement through the radiator. On some cars the electric cooling fan is mounted in front of the radiator (between the front bumper and radiator and it forces the air through the radiator towards the engine compartment) and on other cars the electronic fan, or the viscoven is mounted between the radiator and the engine block and sucks the air through the radiator.

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