Four Seasons 39591 A/C Expansion Valve - Rear

Rear A/C Expansion Valve for Select GM SUVs

The Four Seasons 39591 expansion valve is a block-type A/C flow restrictor built for rear HVAC service in select Cadillac, Chevrolet, and GMC applications. It is an aluminum, R134A expansion valve that meets or exceeds OEM requirements and is configured without a solenoid.

Use this Four Seasons Expansion Valve when servicing rear air conditioning on 2015-2019 Cadillac Escalade ESV, 2016-2018 Chevrolet Suburban 3500 HD, and 2015-2018 GMC Yukon XL models. The 39591 part number is also a direct reference point for technicians and parts lookup.

Key Features

• Four Seasons Expansion Valve, part number 39591
• Block type A/C expansion valve for rear HVAC systems
• Aluminum construction for A/C service applications
• Designed for R134A refrigerant systems
• Meets or exceeds OEM specifications
• Female liquid and suction connections with sealing washer styles
• Female insert O-ring suction inlet style
• Mounting hole quantity: 2
• Super heat setting: -4.0
• Style: without solenoid

Product Details

The Four Seasons Expansion Valve 39591 regulates refrigerant flow into the rear evaporator circuit, helping maintain proper system balance in rear A/C operation. Its block-style design, aluminum body, and OEM-level specification make it a direct-fit service part for rear HVAC repair on the listed Cadillac Escalade ESV, Chevrolet Suburban 3500 HD, and GMC Yukon XL applications. This part cross-references UAC EX10600C for the same application.

Common Problems This Part Can Address

• Rear A/C outlet air that is too warm
• Uneven cooling between front and rear HVAC zones
• Restricted refrigerant metering at the rear evaporator
• Erratic system performance after A/C service
• Leak-related service needs at the expansion valve connection points

Installation Notes

• Fits 2015-2019 Cadillac Escalade ESV, rear.
• Fits 2016-2018 Chevrolet Suburban 3500 HD, rear.
• Fits 2015-2018 GMC Yukon XL, rear.
• Verify refrigerant type and connection style before installation.
• Replace sealing washers and O-rings as required during A/C service.
• Follow proper evacuation and recharge procedures after installation.

Quality Assurance

Four Seasons 39591 is built to meet or exceed OEM specifications for the listed rear HVAC applications. It is engineered for R134A systems and supplied as a service replacement expansion valve for professional A/C repair.