Four Seasons 39554 A/C Expansion Valve

Mercedes-Benz A/C Expansion Valve 39554

Four Seasons 39554 is a block-type A/C expansion valve for R134A systems. It is built from aluminum, uses captured O-ring connections, and meets or exceeds OEM requirements for the listed Mercedes-Benz applications.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 39554
• Block-type A/C expansion valve for R134A refrigerant
• Aluminum construction with aluminum finish
• Captured O-ring liquid and suction connections
• Female inlet and outlet fittings
• Mounting hole quantity: 2
• Style: w/o solenoid
• Super heat: -10.5
• Tonnage: 1.5
• Meets or exceeds OEM specifications

Product Details

The Four Seasons Expansion Valve line is built for precise refrigerant metering in automotive HVAC systems. This Four Seasons 39554 expansion valve uses a block-style design with female O-ring ports for the liquid and suction sides, making it a direct service part for select Mercedes-Benz AMG GT and SL-Class models. It is specified for R134A systems and is listed as a no-solenoid design.

Cross-reference part numbers for the same application include 217554 and 759764. This part number 39554 is also associated with Mercedes-Benz AMG GT, AMG GT C, AMG GT R, AMG GT 63, SL550, and related applications listed below.

Vehicle Fitment

• Fits 2018-2021 Mercedes-Benz AMG GT, N/A
• Fits 2021 Mercedes-Benz AMG GT Black Series, N/A
• Fits 2018-2021 Mercedes-Benz AMG GT C, N/A
• Fits 2018-2021 Mercedes-Benz AMG GT R, N/A
• Fits 2019-2020 Mercedes-Benz AMG GT 53, N/A
• Fits 2019-2020 Mercedes-Benz AMG GT 63, N/A
• Fits 2019-2020 Mercedes-Benz AMG GT 63 S, N/A
• Fits 2020 Mercedes-Benz AMG GT R Pro, N/A
• Fits 2018-2020 Mercedes-Benz AMG GT S, N/A
• Fits 2017-2020 Mercedes-Benz SL450, N/A
• Fits 2013-2020 Mercedes-Benz SL550, N/A
• Fits 2013-2019 Mercedes-Benz SL500, N/A
• Fits 2013-2019 Mercedes-Benz SL63 AMG, N/A
• Fits 2013-2019 Mercedes-Benz SL65 AMG, N/A
• Fits 2015-2016 Mercedes-Benz SL400, N/A

Common Repair Uses

• Restores refrigerant flow control in a Mercedes-Benz A/C system
• Addresses weak or inconsistent cabin cooling
• Helps correct improper evaporator feed from a worn expansion valve
• Supports repair of A/C performance issues tied to metering problems
• Replaces a leaking or restricted block-type expansion valve

Installation Notes

Verify the vehicle uses an R134A system and confirm the port style, mounting points, and line sizes before installation. This valve uses captured O-ring liquid and suction connections with No. 8 and No. 12 thread diameters as listed in the product data. Always inspect the A/C system for contamination, replace damaged seals as needed, and evacuate and recharge the system to the correct specification after service.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements for the covered applications. The part is engineered for direct replacement service in the specified Mercedes-Benz models, including AMG GT and SL-Class vehicles.