Four Seasons 39058 A/C Expansion Valve

Four Seasons 39058 Expansion Valve Overview

Four Seasons 39058 is a block-type A/C expansion valve for R134A systems. It is built from aluminum and uses female insert O-ring connections for the liquid and suction lines, making it a direct-fit style service part for select Nissan Pathfinder and INFINITI QX4 applications.

This Four Seasons Expansion Valve line focuses on OE-style HVAC flow control for vehicles that need precise refrigerant metering. Part number 39058 is listed as meeting or exceeding OEM requirements and is specified for 1.5 ton systems with a w/o solenoid design.

Key Features

• Four Seasons Expansion Valve, part number 39058
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• Female FIO insert O-ring liquid and suction connections
• Liquid inlet and outlet size: 14 mm / 0.55 in
• Suction inlet and outlet size: 17.6 mm / 0.69 in
• Two mounting holes for OE-style installation
• Meets or exceeds OEM specifications
• Designed without solenoid

Detailed Description

Four Seasons 39058 is an A/C expansion valve that regulates refrigerant flow into the evaporator to support proper cooling performance. Its block-type design, aluminum body, and insert O-ring fittings are matched to R134A systems used in 2000-2001 Nissan Pathfinder and 2000-2001 INFINITI QX4 applications. Search terms such as Nissan Pathfinder A/C expansion valve, INFINITI QX4 HVAC expansion valve, and Four Seasons 39058 replacement valve all point to this exact service part.

Fitment includes Fits 2000-2001 Nissan Pathfinder, N/A and Fits 2000 INFINITI QX4, N/A; it also fits 2001 INFINITI QX4, N/A. This part cross-references UAC EX10111C for the same application.

Common Issues This Part May Address

• Warm air from the vents caused by incorrect refrigerant metering
• Uneven cabin cooling in R134A A/C systems
• Restricted refrigerant flow through a worn or sticking expansion valve
• HVAC performance loss after A/C service or component replacement
• System operation concerns tied to OE-style block valve wear

Installation Notes and Tips

Verify the vehicle’s refrigerant type, line sizes, and mounting style before installation. Replace the O-ring seals at the connections, evacuate and recharge the system to the correct specification, and inspect the compressor, condenser, and evaporator for contamination or debris that could affect the new valve.

For fitment confirmation, use this part on 2000-2001 Nissan Pathfinder and 2000-2001 INFINITI QX4 applications listed above. The part number 39058 should be matched to the vehicle’s original valve style and connection dimensions before service.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements, supporting OE-style replacement quality for the specified applications.