Four Seasons 39644 A/C Expansion Valve

Four Seasons 39644 Expansion Valve Overview

Four Seasons 39644 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and O-ring style connections. It is an OE-style replacement that meets or exceeds OEM requirements and is listed for select Nissan and INFINITI applications, including Rogue, Rogue Sport, and QX50 models.

This Four Seasons Expansion Valve line focuses on accurate refrigerant metering and service-ready fitment for modern HVAC systems. The 39644 part number is used in applications where stable superheat control and proper liquid-to-suction flow regulation are required.

Key Features

• Part number 39644 from Four Seasons Expansion Valve
• Block-type A/C expansion valve for R134A refrigerant
• Aluminum construction for HVAC service applications
• Female O-ring inlet and outlet fittings
• Liquid inlet and outlet: No. 6 and No. 8 thread diameters
• Suction inlet and outlet: No. 10 and No. 12 thread diameters
• Two mounting holes
• 1-tonnage configuration
• Super heat setting: -4.50
• Meets or exceeds OEM specifications
• Without solenoid; switch not included

Detailed Description

Four Seasons 39644 is an A/C expansion valve designed to regulate refrigerant flow in R134A HVAC systems. Its block-type design, aluminum housing, and O-ring style connections support service replacement in vehicles that require precise refrigerant metering at the evaporator. The valve is specified with female fittings on both the liquid and suction sides, along with No. 6/No. 8 liquid thread diameters and No. 10/No. 12 suction thread diameters for the listed applications.

Compatible With 2021 Nissan Rogue Sport, 2019-2020 INFINITI QX50, 2020 Nissan Rogue, and 2020 Nissan Rogue Sport. This part cross-references UAC EX10721C for the same application. The Four Seasons 39644 part number is also referenced in interchange listings for select OE and aftermarket service needs.

What It Helps Address

• Weak or inconsistent cabin cooling
• Improper refrigerant flow through the evaporator circuit
• Incorrect superheat control in the A/C system
• HVAC performance issues caused by a worn expansion valve
• Service replacement needs on listed Nissan and INFINITI models

Installation Notes and Tips

Verify the vehicle’s refrigerant type, fitting style, and thread diameters before installation. This valve uses O-ring connections and is specified without a solenoid, so confirm the original system configuration matches the part before service. For the listed fitments, use the exact application notes: Fits 2021 Nissan Rogue Sport, N/A, To 6/2020; Expansion Valve. Fits 2019-2020 INFINITI QX50, N/A, Expansion Valve. Fits 2020 Nissan Rogue, N/A, Japan Built; Expansion Valve. Fits 2020 Nissan Rogue Sport, N/A, Expansion Valve.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM specifications, making it a direct-fit service part for the confirmed applications. The 39644 designation helps ensure the correct replacement is selected for the specified Nissan Rogue, Rogue Sport, and INFINITI QX50 HVAC systems.