Four Seasons 39443 A/C Expansion Valve - Front

Overview of Four Seasons Expansion Valve 39443

The Four Seasons Expansion Valve 39443 is designed specifically for select Lexus and Toyota models, including the Highlander and RX400h. This A/C expansion valve plays a critical role in regulating refrigerant flow within the vehicle's air conditioning system, ensuring optimal cooling performance.

• Constructed from durable aluminum material with an aluminum finish
• Compatible with R134a refrigerant type
• Block type design with two mounting holes for secure installation
• Female suction inlet and outlet fittings with No. 12 thread diameter (non-threaded)
• Female liquid inlet and outlet fittings featuring captured o-ring seals for leak prevention
• Meets or exceeds OEM specifications for reliable fit and function

Detailed Product Description

This Four Seasons Expansion Valve 39443 is engineered as a block type valve made from aluminum, providing corrosion resistance and durability under typical automotive HVAC conditions. It is designed to work with R134a refrigerant, the standard for many modern vehicles. The valve includes two mounting holes to ensure a stable and secure fit within the A/C system. Both suction and liquid fittings are female with specific thread diameters—No. 12 for suction and No. 6 and No. 10 for liquid inlet and outlet respectively—using captured o-ring seals to maintain a tight, leak-free connection.

The captured o-ring style fittings (green o-rings, part numbers 24611 and 24661) help maintain system integrity and prevent refrigerant loss. This expansion valve is compatible with Lexus Highlander and Toyota RX400h models, making it a precise replacement part for these vehicles. The part number 39443 ensures you are selecting the correct component for your HVAC repair or maintenance needs.

About the Four Seasons Expansion Valve Product Line

The Four Seasons Expansion Valve product line focuses on providing reliable A/C flow restrictors designed to meet or exceed OEM standards. This line includes block type expansion valves like the 39443, which are engineered for specific vehicle applications to ensure proper refrigerant metering and system efficiency. Choosing a valve from this product line supports consistent air conditioning performance and system longevity.

Common Applications and Issues Addressed

• Regulates refrigerant flow to maintain proper evaporator pressure
• Prevents compressor damage caused by improper refrigerant metering
• Eliminates inconsistent cabin cooling or warm air blowing from vents
• Resolves refrigerant leaks due to worn or damaged expansion valves
• Supports efficient operation of the A/C system in Lexus Highlander and Toyota RX400h models

Installation Notes and Tips

• Ensure compatibility with vehicle make and model before installation
• Use proper tools to avoid damaging the aluminum fittings and o-rings
• Replace o-rings with the included green o-rings (24611 and 24661) to maintain a proper seal
• Follow manufacturer torque specifications for mounting bolts
• Evacuate and recharge the A/C system with R134a refrigerant after installation

Quality Assurance and Warranty

The Four Seasons Expansion Valve 39443 meets or exceeds OEM quality standards, providing reliable performance and durability. This part is manufactured to strict specifications to ensure proper fit and function in compatible Lexus and Toyota vehicles. Warranty coverage details should be confirmed with the point of purchase or manufacturer documentation.