Four Seasons 39172 A/C Expansion Valve

Four Seasons 39172 Expansion Valve Overview

Four Seasons 39172 is a block-type A/C expansion valve for R134A systems. It is built from aluminum with a gold finish and meets or exceeds OEM requirements for direct replacement service on select Subaru applications.

Compatible with 1998-2001 Subaru Impreza and 1998-2000 Subaru Forester, this expansion valve helps regulate refrigerant flow through the HVAC system for stable evaporator performance. The Four Seasons Expansion Valve line is focused on OE-style service parts for air conditioning repairs, and part number 39172 follows that approach with application-specific fitment and factory-style connections.

Key Features

• Four Seasons part number 39172
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with gold finish
• Female inlet and outlet connections with O-ring sealing
• Liquid inlet uses captured O-ring design; liquid outlet uses female insert O-ring design
• Suction-side female insert O-ring and captured O-ring connections
• Super heat setting: 3.500
• Meets or exceeds OEM specifications
• Compatible with 1998-2001 Subaru Impreza and 1998-2000 Subaru Forester

Detailed Description

The Four Seasons 39172 expansion valve is an HVAC flow restrictor used to meter refrigerant into the evaporator based on system demand. Its block-style design, R134A calibration, and OE-style O-ring fittings make it a practical replacement for service work on Subaru Impreza and Subaru Forester models listed in the fitment data. The valve is specified for 1.500 tonnage applications and uses a non-solenoid configuration.

This part cross-references UAC EX10340C for the same application. For buyers searching for a Subaru Impreza expansion valve or Subaru Forester A/C expansion valve, part number 39172 provides a direct-reference option with the listed inlet and outlet sizes and factory-style sealing surfaces.

What It Helps Address

• Inconsistent evaporator refrigerant metering
• A/C cooling loss caused by a worn or restricted expansion valve
• Improper suction or liquid line flow control
• HVAC performance issues tied to damaged O-ring sealing points
• Service replacement needs on 1998-2001 Subaru Impreza and 1998-2000 Subaru Forester

Installation Notes and Tips

Verify the vehicle’s refrigerant type before installation; this valve is specified for R134A systems. Confirm the inlet and outlet styles, thread diameters, and O-ring sealing surfaces against the original part before assembly. Replace any disturbed seals during A/C service, evacuate the system properly, and recharge to the vehicle’s specified refrigerant amount after repairs.

Quality Assurance

Four Seasons 39172 is listed as meeting or exceeding OEM requirements. The part is built for application-specific HVAC service and is intended to support proper refrigerant control in the listed Subaru models.