Four Seasons 39138 A/C Expansion Valve

Four Seasons 39138 Expansion Valve

Four Seasons 39138 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and OE-style FIO insert O-ring connections. It is specified for 1999-2002 INFINITI G20 applications and meets or exceeds OEM requirements for direct replacement service.

Key Features

• Brand Line: Four Seasons Expansion Valve
• Part Number: 39138
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with gold finish
• Female suction and liquid inlet/outlet fittings with insert O-ring style connections
• Liquid inlet and outlet size: 0.64 in. (16.2 mm)
• Suction inlet and outlet size: 0.78 in. (19.8 mm)
• Super heat setting: 3.500
• Meets or exceeds OEM specifications
• Fits 1999-2002 INFINITI G20, N/A

Product Details

Four Seasons 39138 is part of the Expansion Valve line and is engineered to regulate refrigerant flow through the evaporator in an R134A air conditioning system. The block-style design, aluminum housing, and insert O-ring FIO fittings support a precise OE-style replacement for the 1999-2002 INFINITI G20. If you are searching for an INFINITI G20 A/C expansion valve, Four Seasons 39138 provides the correct fitment and connection style for this application.

This part cross-references UAC EX10110C for the same application.

Common Problems This Part Can Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss caused by a restricted or worn expansion valve
• Temperature fluctuations during compressor cycling
• Service replacement for a failed INFINITI G20 expansion valve

Installation Notes and Tips

• Verify R134A system compatibility before installation.
• Match the suction and liquid fitting sizes and styles to the original component.
• Inspect the mating surfaces and replace damaged O-rings during service.
• Confirm the valve orientation and mounting hole alignment before tightening.
• Evacuate and recharge the system according to factory service procedures after replacement.

Quality Assurance

Four Seasons 39138 is listed as meeting or exceeding OEM requirements, making it a direct-fit service part for the specified INFINITI G20 applications. Four Seasons expansion valves are built for OE-style replacement where correct refrigerant control and fitment are critical.