The Genuine Porsche A/C Expansion Valve (part number 99657392901) is a crucial component in the air conditioning system of Porsche 911 models. It is responsible for regulating the flow of refrigerant into the evaporator, which is essential for cooling the air inside the vehicle. This expansion valve is a genuine OEM part, designed and manufactured by Porsche to meet the highest quality standards. It is made from durable materials and is built to last, ensuring optimal performance and reliability. This A/C expansion valve is a direct replacement for the original part and is compatible with 911 models from 1999 to 2005. It is an essential part for maintaining a comfortable and cool driving experience in your Porsche.