One of the reasons why a turbocharged engine has more power than a regular engine is that its ventilation is more efficient than the natural intake of a typical engine. When the air enters the turbocharger, its temperature will increase greatly, the density of the corresponding smaller, and the cooler is to play the role of cooling air, high-temperature air through the cooling of the medium cooler, and then into the engine.
If the medium cooler is missing and the pressurized high temperature air enters the engine directly, the engine will explode or even damage the extinguishing phenomenon due to the high air temperature. The cooler is usually found in a turbocharged car.
Because the cooler is actually a turbocharged accessory part, and its role is to improve the ventilation efficiency of the turbocharged engine.