Car air conditioning systems are designed to cool the air inside the cabin of a vehicle. The main components of an air conditioning system include a compressor, a condenser, an evaporator, and an expansion valve. The compressor is driven by the vehicle’s engine and is responsible for circulating refrigerant throughout the system. The condenser is a set of cooling coils that are used to cool and condense the hot, high–pressure refrigerant gas into a liquid. The evaporator is a set of cooling coils that absorb heat from the air inside the cabin, which cools the air before it is circulated throughout the cabin. The expansion valve is responsible for regulating the flow of refrigerant throughout the system.