What is the purpose of an orifice tube?

An orifice tube is a key component in some automotive air conditioning systems, primarily in fixed orifice designs. Its purpose is to regulate the flow of refrigerant between the high-pressure and low-pressure sides of the system, allowing for expansion and cooling. The tube creates a pressure drop, which helps to convert the refrigerant from a liquid to a gas, facilitating heat absorption and effective cooling within the vehicle's cabin.