Four Seasons 39450 A/C Expansion Valve - Rear
OE Quality 60-Day Returns
Four Seasons
 Expansion Valve

Four Seasons 39450 A/C Expansion Valve - Rear

Brand Four Seasons 39450
Position Rear
Color Aluminum
Description Expansion Valves
Liquid Inlet Fitting Gender Female
Liquid Inlet Fitting Thread Diameter No. 6
Liquid Inlet Size IN 0.4
Liquid Inlet Size MM 10.15
Liquid Inlet Style Captured O-Ring
Liquid Inlet Thread Type Not Threaded
Liquid Inlet Type O-Ring
Liquid Outlet Fitting Gender Female
Liquid Outlet Fitting Thread Diameter No. 8
Liquid Outlet Style Female Insert O-Ring
Liquid Outlet Thread Type Not Threaded
Liquid Outlet Type O-Ring
Lqd Out Size IN 0.550
Lqd Out Size MM 14.000
Material Aluminum
Meets / Exceeds OEM? Yes
Mounting Hole Quantity 2
O-Ring A Number/Desc [24611] / Green O-Ring
O-Ring B Number/Desc [24661] / Green O-Ring
O-Ring C Number/Desc [24150] / Green O-Ring
O-Ring D Number/Desc [24681] / Green O-Ring
Refrigerant Type R134A
Style w/o Solenoid
Suc In Size IN 0.700
Suc In Size MM 17.8
Suc Out Size IN 0.72
Suc Out Size MM 18.3
Suction Inlet Fitting Gender Female
Suction Inlet Fitting Thread Diameter No. 10
Suction Inlet Style Female Insert O-Ring
Suction Inlet Thread Type Not Threaded
Suction Inlet Type O-Ring
Suction Outlet Fitting Gender Female
Suction Outlet Fitting Thread Diameter No. 12
Suction Outlet Style Captured O-Ring
Suction Outlet Thread Type Not Threaded
Suction Outlet Type O-Ring
Super Heat 17.5
Switch Included? Not Included
Tonnage 1.5
Type Block Type
Product line Expansion Valve
Fits Nissan and INFINITI · 15 vehicles

OE direct replacement. Meets or exceeds OEM requirements for dependable A/C service.

Block type design. Built for efficient refrigerant flow control in the system.

Aluminum construction. Lightweight material resists corrosion and handles heat well.

Cross-references Four Seasons 39450, Global Parts Distributors LLC 3411613 and UAC EX10402C for the same application. See all 10.

$33.42Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $33.42
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all A/C Expansion Valve options

Rear A/C Expansion Valve for Nissan Pathfinder and INFINITI QX60

Four Seasons 39450 is a block-type A/C expansion valve for rear HVAC systems using R134A refrigerant. It meters liquid refrigerant into the evaporator to help maintain proper superheat and stable rear air conditioning performance in the 2013-2020 Nissan Pathfinder, 2014-2019 INFINITI QX60, and 2013 INFINITI JX35.

Key Features

  • Four Seasons Expansion Valve line, part number 39450
  • Block-type A/C expansion valve for rear HVAC service
  • Aluminum construction with aluminum finish
  • R134A refrigerant type
  • Meets or exceeds OEM requirements
  • Designed for 1.5 tonnage applications with 17.5 super heat
  • Female O-ring inlet and outlet connections
  • Fits rear position applications on select Nissan and INFINITI models

Product Details

Four Seasons 39450 is built as an OE-style replacement expansion valve for rear climate control systems. The valve uses a block-type design with captured and female insert O-ring connections, aluminum construction, and the specified inlet and outlet sizes for the liquid and suction circuits. This part number 39450 is listed for rear HVAC service on the Nissan Pathfinder, INFINITI QX60, and INFINITI JX35, making it a direct-fit choice for common rear A/C repair work on these vehicles.

This part cross-references UAC EX10402C for the same application.

What It Helps Address

  • Rear A/C air that is too warm or inconsistent
  • Improper refrigerant metering at the evaporator
  • High or unstable superheat readings
  • Restricted refrigerant flow in the rear HVAC circuit
  • Loss of rear passenger cooling performance

Installation Notes and Tips

  • Fits 2013-2020 Nissan Pathfinder, rear expansion valve
  • Fits 2014-2019 INFINITI QX60, rear expansion valve
  • Fits 2013 INFINITI JX35, rear expansion valve
  • Verify R134A system service procedures before installation
  • Inspect mating O-ring surfaces and replace damaged seals as needed
  • Confirm line orientation and connection sizes before tightening
  • Evacuate and recharge the system according to factory specifications after service

Quality Assurance

Four Seasons 39450 is listed as meeting or exceeding OEM requirements. The Four Seasons Expansion Valve line is built for service replacement applications where correct refrigerant control and fitment accuracy matter.

Related reading

This part fits 15 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2020NissanPathfinderRearExpansion Valve
2019INFINITIQX60RearExpansion Valve
2019NissanPathfinderRearExpansion Valve
2018INFINITIQX60RearExpansion Valve
2018NissanPathfinderRearExpansion Valve
2017INFINITIQX60RearExpansion Valve
2017NissanPathfinderRearExpansion Valve
2016INFINITIQX60RearExpansion Valve
2016NissanPathfinderRearExpansion Valve
2015INFINITIQX60RearExpansion Valve
2015NissanPathfinderRearExpansion Valve
2014INFINITIQX60RearExpansion Valve
2014NissanPathfinderRearExpansion Valve
2013INFINITIJX35RearExpansion Valve
2013NissanPathfinderRearExpansion Valve
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 39450Global Parts Distributors LLC — 3411613UAC — EX10402C180387217450759450807355922003KA0A3131419T39450