Four Seasons 39117 A/C Expansion Valve - Front

Four Seasons 39117 Expansion Valve Overview

Four Seasons 39117 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and OE-style fitment details for select Nissan and INFINITI applications. It is specified for vehicles such as the Nissan Frontier, Nissan Titan, Nissan Xterra, Nissan Pathfinder, Nissan Armada, Nissan Quest, and INFINITI QX56.

The Four Seasons Expansion Valve line focuses on precise refrigerant metering for automotive HVAC systems. This 39117 valve follows the original equipment style layout with female O-ring connections, a 2-hole mounting pattern, and a superheat setting of 5.5, making it a direct-service replacement for the listed applications.

Key Features

• Part number: 39117
• Brand: Four Seasons Expansion Valve
• Block-type A/C expansion valve
• Aluminum construction
• For R134A refrigerant systems
• Female suction and liquid connections with O-ring sealing
• 2 mounting holes
• Meets or exceeds OEM requirements
• Style: w/o solenoid
• Super heat setting: 5.5

Detailed Description

Four Seasons 39117 is an A/C expansion valve designed to regulate refrigerant flow into the evaporator on compatible Nissan and INFINITI HVAC systems. The valve uses captured and insert O-ring sealing surfaces across the suction and liquid ports, with aluminum material selected for service in automotive air conditioning assemblies. Connection sizes include No. 12 suction inlet and outlet threads, plus No. 6 liquid inlet and No. 8 liquid outlet thread diameters, all in a non-threaded O-ring style configuration.

Fits 2005-2021 Nissan Frontier, N/A; Fits 2005-2015 Nissan Armada, Front; Fits 2004-2015 Nissan TITAN, N/A; Fits 2005-2015 Nissan Xterra, N/A; Fits 2005-2012 Nissan Pathfinder, Front; Fits 2004-2010 INFINITI QX56, Front; Fits 2004-2009 Nissan Quest, Front. This part cross-references UAC EX9719C and EX10187C for the same application. Part number 39117 is also referenced in interchange listings for service matching.

Common A/C Problems This Part May Address

• Irregular evaporator refrigerant control
• Weak or inconsistent cabin cooling
• Incorrect A/C pressure balance across the system
• Expansion valve leakage at O-ring sealing points
• HVAC performance issues tied to a worn block-type valve

Installation Notes and Tips

Verify the vehicle’s refrigerant type, port style, and mounting layout before installation. Confirm the suction and liquid connection sizes match the original component, and replace any disturbed O-rings with the correct seals for the system. After installation, evacuate and recharge the A/C system according to factory service procedures and check for leaks and proper vent temperature.

Quality Assurance

Four Seasons lists this valve as meeting or exceeding OEM requirements for the specified applications. The part is built as a direct replacement expansion valve for service on the listed Nissan and INFINITI models.