Four Seasons 39374 A/C Expansion Valve - Rear

Four Seasons 39374 Expansion Valve Overview

The Four Seasons 39374 expansion valve is a block-type A/C flow restrictor built for R134A systems. It is an aluminum replacement that meets or exceeds OEM requirements and is specified for rear HVAC service on select Ford Expedition and Lincoln Navigator applications.

For buyers searching for a rear A/C expansion valve for a 2005-2006 Ford Expedition or 2005-2006 Lincoln Navigator, this Four Seasons Expansion Valve line part number 39374 provides the correct block-style configuration with insert O-ring connections.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 39374
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction and aluminum finish
• Rear HVAC application with 2 mounting holes
• Female FIO insert O-ring fittings on liquid and suction ports
• Meets or exceeds OEM specifications
• Factory-style superheat setting: 18.000
• Style: w/o solenoid

Product Details

Four Seasons 39374 is an A/C expansion valve used to regulate refrigerant flow into the evaporator on the rear climate control circuit. The block-type design, R134A refrigerant specification, and insert O-ring port style make it a direct-fit service part for the rear system on 2005-2006 Ford Expedition and 2005-2006 Lincoln Navigator models. This part number 39374 is built with aluminum materials and uses female suction and liquid connections sized for the listed application.

This part cross-references UAC EX10203C for the same application.

What It Helps Address

• Rear A/C air that is not cooling properly
• Refrigerant flow issues at the evaporator
• Incorrect superheat control in the rear HVAC circuit
• Leaking or worn expansion valve service replacement
• Restoring rear climate performance on Expedition and Navigator models

Installation Notes and Tips

Verify the vehicle uses the rear HVAC configuration listed for this part before installation. Inspect the mating O-ring surfaces, replace damaged seals as needed, and confirm the refrigerant system is clean and properly evacuated before recharging. Match the valve orientation and port layout to the original unit, and confirm R134A service procedures are followed during replacement.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements, giving technicians an OE-style replacement option for rear A/C service. Fits 2005-2006 Ford Expedition, rear. Fits 2005-2006 Lincoln Navigator, rear.