The Heater Core in the Volvo S40 is one of the components of the climate control system. It works like a small radiator found underneath the dash. The Heater Core is made from aluminum or brass. It has fins to maximize the area. The hoses connect to the engine water pump. Hot coolant is drawn from the engine. When the heater is switched on, a fan forces air through the core, which is heated by the hot antifreeze and water that is being circulated through the Heater Core. This hot air warms up the inside of the car and is necessary, as it helps you remain comfortable when temperatures are up to and below freezing. The Volvo device warms the interior of the car by utilizing the excess engine heat instead of dispersing heat away from the engine like an ordinary radiator. With a heated air setting, the airflow helps to keep the windshield clear on winter days. In air-conditioned Volvo vehicles, the airflow is first cooled by the coils of the evaporator before being heated by the S40 Heater Core. This improves the dehumidifying effect. The Volvo S40's temperature control can include a valve to direct coolant through the core or a door to shut it off altogether. Some use an electromechanical actuator and a thermistor. Sometimes, a dual climate control system will allow the driver and passenger to be comfortable. Furthermore, this part serves as a secondary radiator, which may assist in cooling the engine by dissipating extra heat.
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