Four Seasons 39423 A/C Expansion Valve

Four Seasons 39423 A/C Expansion Valve

Four Seasons 39423 is a block-type A/C expansion valve built for R134A systems and OE-style service replacement. It uses an aluminum body with sealing-washer connections and a 3.5 super heat setting for controlled refrigerant metering in the HVAC system.

This Four Seasons Expansion Valve line focuses on direct-fit HVAC flow control components for service work on vehicles such as Honda Civic and Toyota Corolla applications where the correct refrigerant feed is critical. Part number 39423 is specified as a block-type valve with female suction and liquid fittings, two mounting holes, and no solenoid.

Key Features

• Four Seasons Expansion Valve line, part number 39423
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with gold finish
• Female suction inlet and outlet fittings, No. 10 thread diameter
• Female liquid inlet and outlet fittings, No. 6 inlet and No. 8 outlet thread diameters
• Sealing-washer style connections on suction and liquid ports
• 2 mounting holes for secure installation
• 3.5 super heat setting
• Meets or exceeds OEM requirements
• Style without solenoid

Product Details

The Four Seasons 39423 expansion valve regulates refrigerant flow into the evaporator to help maintain proper A/C performance in R134A-equipped systems. Its block-type design, female port configuration, and sealing-washer interfaces support service replacement where the original valve uses the same connection style. This part number 39423 is a practical choice for HVAC repairs on Honda Civic and Toyota Corolla platforms when the existing expansion valve is worn, restricted, or no longer controlling refrigerant flow correctly.

This part cross-references Global Parts Distributors LLC 1812010 and FEL-PRO 1615 for the same application.

What It Helps Fix

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss caused by a restricted expansion valve
• Temperature swings from poor super heat control
• Service replacement needs on R134A HVAC systems

Installation Notes

• Verify the system uses a block-type expansion valve with the listed female fitting sizes before installation.
• Inspect sealing washers and mating surfaces for wear or damage during service.
• Recover refrigerant and evacuate the system before opening any A/C lines.
• Confirm the replacement valve matches the vehicle’s original port layout and mounting-hole pattern.
• After installation, recharge the system with the correct refrigerant specification and check for leaks.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements, making it a direct replacement option for professional HVAC service. Part number 39423 is built for R134A applications and follows the brand’s OE-style replacement approach for dependable A/C repair work.