Four Seasons 39009 A/C Expansion Valve - Rear

Four Seasons 39009 Expansion Valve Overview

Four Seasons 39009 is a block-type A/C expansion valve built for R134A systems and aluminum construction. It is an OE-style HVAC flow restrictor for rear and main cabin cooling applications across select Cadillac, Chevrolet, GMC, Buick, Pontiac, Saturn, and Chevrolet Malibu, HHR, Impala, Cobalt, G5, G6, Grand Prix, Monte Carlo, and Ion platforms.

The Four Seasons Expansion Valve line focuses on precise refrigerant metering for stable evaporator performance. Part number 39009 is a direct-fit style replacement for vehicles that use a block-type valve with sealing-washer connections and no solenoid.

Key Features

• Part number: 39009
• Brand: Four Seasons Expansion Valve
• Block-type A/C expansion valve
• Aluminum material and aluminum finish
• Designed for R134A refrigerant systems
• Meets or exceeds OEM requirements
• Style: w/o solenoid
• Mounting hole quantity: 2
• Sealing-washer inlet and outlet connections
• OE cross-reference applications available for select vehicles

Detailed Description

Four Seasons 39009 regulates refrigerant flow into the evaporator so the HVAC system can maintain proper superheat and cooling balance. This valve uses female suction and liquid connections with sealing-washer interfaces, making it suitable for service on systems that require a block-style expansion valve rather than a tube-and-fin or solenoid-equipped design. It is specified for R134A refrigerant and is listed as meeting or exceeding OEM requirements.

Fitment includes rear HVAC service on 2007-2014 Cadillac Escalade ESV, 2008-2014 Chevrolet Suburban 1500, 2008-2013 Chevrolet Suburban 2500, 2008-2013 GMC Yukon XL 1500, and 2008-2013 GMC Yukon XL 2500. It also fits 2004-2012 Chevrolet Malibu, 2006-2011 Chevrolet HHR, 2004-2011 Chevrolet Impala, 2005-2010 Chevrolet Cobalt, 2007-2010 Pontiac G5, 2005-2010 Pontiac G6, 2005-2009 Buick Allure, 2005-2009 Buick LaCrosse, 2007-2009 Saturn Aura, 2004-2008 Pontiac Grand Prix, 2004-2007 Chevrolet Monte Carlo, and 2003-2007 Saturn Ion.

This part cross-references UAC EX529458C and Quality-Built 17794 for the same application.

What It Helps Fix

• Weak or uneven A/C cooling output
• Incorrect refrigerant metering at the evaporator
• HVAC performance issues caused by a worn expansion valve
• Rear A/C cooling complaints on full-size GM SUVs
• System imbalance after service on R134A-equipped vehicles

Installation Notes and Tips

Verify the vehicle’s refrigerant type, valve style, and connection sizes before installation. This valve uses sealing-washer interfaces and is not a solenoid-equipped unit, so confirm the original system matches the block-type design. Replace any worn sealing washers and inspect the surrounding HVAC components for contamination or damage before reassembly.

For fitment-specific service, confirm the application against the vehicle’s HVAC configuration, especially on rear A/C systems in Cadillac Escalade ESV, Chevrolet Suburban, and GMC Yukon XL models. The part number 39009 should be matched to the original valve layout and refrigerant circuit before evacuation and recharge.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements. The aluminum construction and OE-style design support consistent service replacement for compatible GM, Buick, Pontiac, and Saturn applications.