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How We Get Hot and Cold Air in the Car

Model: (Various brands) Various
Part: Air conditioner

Video tutorial

In this short video, we will see how the air conditioning system in our car provides hot and cold air: the two key components are the air conditioning evaporator, which generates cold air, and the heater radiator, which generates hot air (exchanging heat from the engine's boiling coolant).

A motor/fan pushes air from outside, and there are a series of flaps (operated by the cabin controls) that direct the airflow to one of the two components (or a mix of both).

The three modes are cold air: the flaps direct all air through the cold evaporator, and the air conditioning compressor is active. Hot air: the flaps direct air through the hot engine radiator; the air conditioning is off. Air conditioning: the flaps pass air first through the evaporator to dehumidify it, then through the radiator to heat it. This provides warm, dry air to demist the windows and is comfortable.


Posted on 29 August 2026 by ScegliAuto


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by ScegliAuto

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