Four Seasons 39646 A/C Expansion Valve - Front or Rear

Four Seasons 39646 Expansion Valve Overview

The Four Seasons 39646 A/C expansion valve is a block-type HVAC flow restrictor built for R134A systems. It uses an aluminum body with female fittings and an OE-style layout for controlled refrigerant metering in the air conditioning circuit.

Four Seasons Expansion Valve line parts are built for direct replacement service in vehicle HVAC systems, with this application using a no-solenoid design and a 1.5 tonnage rating. The 39646 expansion valve is a fitment-specific service part for Jeep Grand Wagoneer, Jeep Wagoneer, Ram 1500, Ram 2500, Ram 3500, and Nissan NV2500/NV3500 applications listed below.

Key Features

• Four Seasons part number 39646
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• Female suction and liquid connections
• Liquid inlet uses a sealing washer; liquid outlet uses an O-ring
• Suction inlet uses an O-ring; suction outlet uses a sealing washer
• No solenoid included
• Meets or exceeds OEM requirements
• Super heat setting: -8.000
• Mounting hole quantity: 2

Detailed Description

The Four Seasons 39646 expansion valve regulates refrigerant flow into the evaporator to maintain proper A/C system performance. Its block-type design, aluminum construction, and OE-style connection layout support service replacement on R134A-equipped systems. This part cross-references UAC EX10718C for the same application.

Vehicle coverage includes Fits 2022-2025 Jeep Grand Wagoneer, Front; Fits 2023-2025 Jeep Grand Wagoneer L, Front; Fits 2022-2025 Jeep Wagoneer, Front; Fits 2023-2025 Jeep Wagoneer L, Front; Fits 2019-2025 Ram 1500, N/A; Fits 2019-2025 Ram 2500, N/A; Fits 2019-2025 Ram 3500, N/A; Fits 2021 Ram 1500 Classic, N/A; Fits 2012-2019 Nissan NV2500, Rear; and Fits 2012-2019 Nissan NV3500, Rear.

What It Helps Address

• Warm air from the vents caused by incorrect refrigerant metering
• Uneven evaporator performance in the A/C system
• Restricted or inconsistent refrigerant flow through the HVAC circuit
• Service replacement needs on leaking or worn expansion valves
• Loss of cooling performance in Jeep Grand Wagoneer, Jeep Wagoneer, and Ram truck applications

Installation Notes and Tips

Verify refrigerant type, fitting style, and mounting location before installation. Confirm the suction and liquid thread sizes match the vehicle system: suction inlet No. 12, suction outlet No. 10, liquid inlet No. 6, and liquid outlet No. 8. Replace sealing surfaces as needed and follow the vehicle service procedure for evacuation, leak checking, and recharge after installation.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements for the specified applications. The 39646 part number is used for direct replacement service in the listed Jeep, Ram, and Nissan HVAC systems.