Four Seasons 39638 A/C Expansion Valve

Four Seasons 39638 Expansion Valve Overview

Four Seasons 39638 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and OE-style fitment details. It is specified for Acura TLX and Acura RDX applications where precise refrigerant metering is needed for stable cabin cooling.

The Four Seasons Expansion Valve line focuses on direct replacement service parts for automotive HVAC repairs. This 39638 valve follows the listed port styles, thread sizes, and mounting layout for a straightforward match to the original system design.

Key Features

• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction for HVAC service applications
• Female suction inlet and outlet fittings with No. 12 thread diameter
• Female liquid inlet and outlet fittings with No. 6 and No. 10 thread diameters
• O-ring style connections on suction and liquid ports
• 2 mounting holes for OE-style installation
• Meets or exceeds OEM requirements
• Super heat setting: -3.500
• Style: without solenoid

Detailed Description

Four Seasons 39638 expansion valve is engineered for HVAC flow control in R134A air conditioning systems. By regulating refrigerant flow into the evaporator, it supports proper system balance in Acura TLX and Acura RDX models listed for this application. The valve’s block-type design, aluminum body, and O-ring port configuration align with common OE service requirements for Acura TLX expansion valve and Acura RDX A/C repair work.

This part number 39638 cross-references UAC EX10660C for the same application. It is also listed with interchange references including 80220TJBA41 and 80220TJBA42.

Vehicle Fitment

• Fits 2021-2023 Acura TLX, N/A
• Fits 2019-2021 Acura RDX, N/A

What It Helps Address

• Inconsistent cabin cooling from restricted refrigerant metering
• Warm air output when the A/C system is charged but not regulating correctly
• Evaporator performance issues tied to expansion valve flow control
• HVAC service needs on Acura TLX and Acura RDX R134A systems
• Replacement of a worn or failed OE-style expansion valve

Installation Notes and Tips

Confirm refrigerant type, port style, thread diameter, and mounting-hole layout before installation. Replace any disturbed O-rings with the correct A/C service parts, evacuate and recharge the system to specification, and verify proper superheat and vent temperature after repair. This valve is listed without a solenoid and should be matched to the original system configuration.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements for the specified applications. The part number 39638 is cataloged for Acura TLX and Acura RDX fitment with the stated OE-style connection details.