Four Seasons 39573 A/C Expansion Valve

Four Seasons 39573 Expansion Valve for Porsche HVAC

Four Seasons 39573 is a block-type A/C expansion valve built for R134A systems and direct-fit Porsche HVAC service. It is an aluminum replacement that meets or exceeds OEM requirements and is listed for multiple Porsche 718 and 911 applications.

Key Features

• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• O-ring inlet and outlet connections for suction and liquid lines
• Female suction and liquid fittings with no threaded connection
• 2 mounting holes for vehicle-specific HVAC installation
• Meets or exceeds OEM specifications
• Style: w/o solenoid
• Super heat setting: -9.0
• Brand line: Four Seasons Expansion Valve

Detailed Description

Four Seasons 39573 is an A/C expansion valve used to regulate refrigerant flow into the evaporator on Porsche HVAC systems. This block-type valve is specified for R134A applications and uses O-ring sealing surfaces at both the suction and liquid connections for service-friendly replacement. The aluminum body and OEM-level design support accurate refrigerant metering in Porsche 718 Boxster, 718 Cayman, 718 Spyder, 911, Boxster, and Cayman applications.

This part cross-references Monroe Shocks & Struts (e.g., 217573, 759783) for the same application. Four Seasons 39573 is a direct replacement choice for Porsche 718 Boxster, Porsche 718 Cayman, and Porsche 911 HVAC service where the original expansion valve has failed or is no longer regulating refrigerant correctly.

Common Problems This Part Can Address

• Warm air from the vents caused by incorrect refrigerant metering
• Uneven cabin cooling in R134A-equipped Porsche HVAC systems
• Evaporator performance issues related to a sticking or restricted valve
• Compressor cycling concerns tied to improper expansion valve operation
• Loss of cooling efficiency after A/C system service or component wear

Installation Notes and Tips

• Verify the vehicle uses an R134A system before installation.
• Confirm the suction and liquid line O-ring connections match the original valve.
• Inspect the A/C system for contamination, leaks, and damaged seals before replacing the valve.
• Replace any worn O-rings and evacuate/recharge the system according to factory procedures.
• Fits 2017-2025 Porsche 718 Boxster, N/A; w/ R134a; Expansion Valve.
• Fits 2017-2025 Porsche 718 Cayman, N/A; w/ R134a; Expansion Valve.
• Fits 2020-2021 Porsche 718 Spyder, N/A; Expansion Valve.
• Fits 2017-2019 Porsche 911, N/A; w/ R134a; Expansion Valve.
• Fits 2012-2017 Porsche 911, N/A; Expansion Valve.
• Fits 2013-2016 Porsche Boxster, N/A; Expansion Valve.
• Fits 2014-2016 Porsche Cayman, N/A; Expansion Valve.
• Fits 2013 Porsche 911, N/A; Fits HVAC Mode Door Actuator for new body style vehicles.; Expansion Valve.

Quality Assurance

Four Seasons 39573 is engineered as an OEM-style replacement and is listed as meeting or exceeding OEM requirements for the specified Porsche applications. The part number 39573 is also associated with interchange references 217573 and 759783 for application matching.