Four Seasons 39509 A/C Expansion Valve

Four Seasons 39509 Expansion Valve Overview

Four Seasons 39509 is a block-type A/C expansion valve built for R134A systems and engineered to meet or exceed OEM requirements. This aluminum valve is used in Audi HVAC systems where precise refrigerant metering is needed for stable cabin cooling, including Audi A4, A5, S4, S5, Q5, SQ5, Q7, RS5, and A4 allroad applications.

As part of the Four Seasons Expansion Valve line, this component is focused on accurate refrigerant flow control for modern automotive air conditioning systems. The 39509 expansion valve uses O-ring liquid and suction connections, a no-solenoid design, and a 1.5-ton configuration with a -4.50 super heat setting.

Key Features

• Four Seasons Expansion Valve part number 39509
• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• O-ring liquid inlet and outlet connections
• O-ring suction inlet and outlet connections
• Female suction and liquid fittings with No. 12 and No. 8 thread diameters
• 2 mounting holes for secure installation
• Meets or exceeds OEM specifications
• Style: w/o solenoid
• Super heat setting: -4.50
• Tonnage: 1.5

Detailed Description

The Four Seasons 39509 expansion valve regulates refrigerant flow into the evaporator so the HVAC system can maintain proper cooling performance. Its block-style design, aluminum body, and O-ring sealing surfaces are suited to Audi platforms that use R134A refrigerant, including 2012-2016 Audi A5 and A5 Quattro, 2013-2016 Audi A4 and A4 Quattro, 2013-2016 Audi allroad, 2013-2017 Audi S4, 2013-2015 Audi RS5, 2016 Audi Q5 and Q7, and 2016 Audi SQ5. It also applies to 2017-2018 Audi S5, 2018 Audi S5 Sportback, 2017 Audi A5 Quattro, 2017 Audi Q5, 2017 Audi SQ5, and 2017 Audi S5 with HFO-1234yf noted in fitment data.

This part cross-references UAC EX9754C and Global Parts Distributors LLC 3411561 for the same application. Four Seasons 39509 is a direct-fit style replacement for vehicles that require a block-type expansion valve with the listed connection sizes and refrigerant specification.

Common HVAC Problems This Part Addresses

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• HVAC performance loss caused by a worn or restricted expansion valve
• Temperature fluctuation during A/C operation
• System service needs on Audi R134A air conditioning setups

Installation Notes and Tips

Verify refrigerant type, connection style, and mounting-hole layout before installation. This valve uses female O-ring fittings for the liquid and suction sides, so clean sealing surfaces and correct O-ring condition are important for leak-free service. Confirm the vehicle’s HVAC configuration against the fitment data for your exact Audi model and year before replacing the original valve.

Quality Assurance

Four Seasons 39509 is manufactured to meet or exceed OEM requirements for the listed applications. The Four Seasons Expansion Valve line is built for service replacement use in automotive HVAC systems where accurate refrigerant control and proper fitment are required.