Four Seasons 38677 A/C Expansion Valve

Four Seasons 38677 Expansion Valve Overview

Four Seasons 38677 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 2.0 ton applications and uses female FIO insert O-ring connections for the liquid and suction lines.

For drivers searching for an A/C expansion valve for Honda Civic or similar HVAC service applications, this Four Seasons expansion valve provides the connection layout and refrigerant compatibility needed for proper refrigerant metering. Part number 38677 is also listed under common aftermarket cross references for the same application.

Key Features

• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• Female FIO insert O-ring inlet and outlet connections
• 2 mounting holes for block-style HVAC attachment
• Super heat setting: 8.000
• Meets or exceeds OEM requirements
• Style without solenoid
• Four Seasons 38677 expansion valve for HVAC flow control service

Product Details

The Four Seasons Expansion Valve line focuses on refrigerant flow control at the evaporator, helping regulate how liquid refrigerant enters the A/C system. This block-type valve is configured with No. 6 and No. 8 liquid-side thread diameters and No. 8 and No. 10 suction-side thread diameters, along with green O-ring sealing points for the specified connections. Four Seasons 38677 is a direct-fit style service part for technicians replacing a worn or restricted valve in an R134A air conditioning system.

This part cross-references UAC EX9703C for the same application. It is also associated with Honda Civic A/C service searches where the correct block-style expansion valve is needed.

Common Problems This Part Can Address

• Weak cabin cooling caused by restricted refrigerant metering
• Erratic evaporator performance from a sticking expansion valve
• Improper A/C pressure balance in an R134A system
• Leaks at the valve connection points due to worn sealing surfaces
• HVAC service needs on a Honda Civic or similar vehicle application

Installation Notes and Tips

Verify the valve style, line sizes, and refrigerant type before installation. Replace the O-rings with the correct green seals for the specified connections, and inspect the mating surfaces for corrosion or debris before assembly. Confirm the system is evacuated and charged to the vehicle manufacturer’s specifications after service. For Honda Civic A/C repair work, match the block-type layout and fitting orientation to the original component.

Quality Assurance

Four Seasons 38677 is listed as meeting or exceeding OEM requirements, making it a practical OE-style replacement for HVAC repair and maintenance. The Four Seasons Expansion Valve product line is built for accurate refrigerant control and serviceable fitment in R134A air conditioning systems.