The expansion valve, also known as a metering device, plays a crucial role in the air conditioning (AC) system. It controls the amount of refrigerant that enters the evaporator, ensuring efficient cooling. As the high-pressure liquid refrigerant passes through the expansion valve, its pressure drops significantly. This process causes a portion of the refrigerant to vaporize, preparing it to absorb heat in the evaporator. Proper functioning of the expansion valve is essential for maintaining the desired cabin temperature and preventing damage to other AC components. NISSENS is a trusted brand known for its quality automotive parts.