Four Seasons 39702 A/C Expansion Valve

Four Seasons 39702 Expansion Valve

Four Seasons 39702 is a block-type A/C expansion valve for R134A systems. Built from aluminum and engineered to meet or exceed OEM requirements, it is a direct replacement for select Buick Encore GX and Chevrolet Trailblazer applications.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 39702
• Block-type A/C expansion valve for HVAC flow control
• Aluminum construction for mobile A/C service
• Refrigerant type: R134A
• Liquid inlet: No. 6 with sealing washer
• Liquid outlet: No. 8 with sealing washer
• Suction inlet: No. 10 with sealing washer
• Suction outlet: No. 10 with sealing washer
• Style: w/o solenoid
• Mounting hardware included: Yes
• Meets or exceeds OEM specifications

Product Details

Four Seasons 39702 is part of the Expansion Valve line, a product family focused on precise refrigerant metering for automotive air conditioning systems. This valve helps regulate refrigerant flow through the evaporator circuit, supporting stable cabin cooling performance in R134A-equipped vehicles. It is listed for 2020-2024 Buick Encore GX and 2021-2024 Chevrolet Trailblazer applications, making it a fitment-based replacement for common compact SUV HVAC service needs. The part number 39702 is also referenced under cross-application numbers 217722 and 42699689 for the same application.

What It Helps Address

• Weak or inconsistent A/C cooling output
• Improper refrigerant metering at the evaporator
• Temperature fluctuations from a worn expansion valve
• HVAC performance issues after A/C system service
• Leak-prone sealing surfaces at the valve connections

Installation Notes and Tips

Verify refrigerant type, port sizes, and block-style configuration before installation. Replace sealing washers as needed and confirm all mating surfaces are clean and undamaged. This valve is specified without a solenoid and uses No. 6, No. 8, and No. 10 sealing-washer connections, so matching the original system layout is important for proper fit and sealing. For Buick Encore GX and Chevrolet Trailblazer service, confirm the vehicle’s A/C system configuration against the original part before reassembly.

Quality Assurance

Four Seasons states that its mobile A/C products are engineered and tested for long service life, drawing on more than 50 years of air conditioning experience. This expansion valve is built to meet or exceed OEM standards for the listed applications.