Nissens 999326 A/C Expansion Valve - Front or Rear

Nissens A/C Expansion Valve for Porsche 911 and 928

The Nissens 999326 A/C expansion valve regulates refrigerant flow in the air conditioning system to help maintain stable evaporator performance. Built from aluminum and configured for R134A systems, it is a direct-fit HVAC flow restrictor for select Porsche 911 and Porsche 928 applications.

Key Features

• Aluminum block-style A/C expansion valve
• Designed for R134A refrigerant systems
• Includes O-rings for sealing at the connection points
• Liquid inlet thread diameter: 0.4300
• Liquid outlet thread diameter: 0.5500
• Suction inlet thread diameter: 0.6300
• Suction outlet thread diameter: 0.6300
• Fits Porsche 911 and Porsche 928 HVAC applications

Detailed Description

Nissens part number 999326 is an A/C expansion valve engineered for select Porsche 911 and Porsche 928 models. As a block-style valve, it meters refrigerant entering the evaporator so the HVAC system can maintain proper cooling balance under R134A operation. The aluminum construction supports reliable fitment in the thermal management circuit, while the included O-rings help support sealing at the refrigerant connections. This part cross-references Four Seasons 38685 for the same application.

Compatible fitment includes 1989-1998 Porsche 911, 1986-1991 Porsche 928, 1993-1995 Porsche 928, 1985 Porsche 928 Rear for Auxiliary HVAC, and 1985 Porsche 928 Front from chassis/VIN 92GS861001. If you are sourcing a Porsche 911 expansion valve or a Porsche 928 A/C expansion valve, Nissens 999326 matches the listed vehicle applications.

What This Part Helps Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss from a worn internal valve
• Refrigerant leakage at the valve connection points
• HVAC system service needs on Porsche 911 and Porsche 928 models

Installation Notes and Tips

Verify the vehicle year, model, and position before ordering, especially on 1985 Porsche 928 applications where front and rear configurations differ. Replace the O-rings during service and confirm the system is clean and properly evacuated before recharging with R134A. Check the liquid and suction fitting thread diameters against the original part to confirm correct installation.

Quality Assurance

Nissens develops and manufactures thermal management components to consistent quality standards across its aftermarket range. Part number 999326 is built to support dependable A/C service on the listed Porsche applications.