Four Seasons 39618 A/C Expansion Valve - Front

Four Seasons 39618 Expansion Valve

The Four Seasons 39618 expansion valve is a block-type A/C flow restrictor built for R134A systems. It uses an aluminum body with O-ring inlet and outlet connections, and it meets or exceeds OEM requirements for direct replacement service on select Volkswagen applications.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 39618
• Block type design for R134A air conditioning systems
• Aluminum construction
• Female O-ring suction and liquid connections
• 2 mounting holes
• Super heat setting: 2.500
• Style: w/o solenoid
• Meets or exceeds OEM specifications

Product Details

Four Seasons 39618 is an A/C expansion valve for HVAC systems that regulate refrigerant flow into the evaporator. This block-type valve is configured with female suction inlet and outlet fittings in No. 10 and No. 12 thread diameters, plus female liquid inlet and outlet fittings in No. 6 and No. 8 thread diameters. It is specified for R134A refrigerant and uses O-ring sealing surfaces for the suction and liquid ports. This part cross-references UAC EX10680C for the same application.

Compatible With Volkswagen Atlas front applications for 2018-2022 and 2024-2025, Volkswagen Atlas Cross Sport applications for 2020-2025, and Volkswagen Tiguan applications for 2019-2020. The Four Seasons 39618 is a direct-fit service part for vehicles that need precise refrigerant metering at the expansion valve.

What It Helps Address

• Inconsistent evaporator refrigerant flow
• Weak or uneven cabin cooling
• Incorrect superheat control in the A/C circuit
• Leak-prone valve connections caused by worn O-rings or damaged sealing surfaces
• Service replacement for a failed Volkswagen Atlas, Atlas Cross Sport, or Tiguan expansion valve

Installation Notes and Tips

Verify the refrigerant type, port sizes, and mounting layout before installation. Match the suction and liquid fitting thread diameters to the original valve, and inspect the O-ring sealing surfaces for wear or contamination. Proper evacuation, recharge, and system leak testing should be completed after replacement to restore correct A/C operation.

Quality Assurance

Four Seasons 39618 is built to meet or exceed OEM specifications for the listed applications. Its aluminum construction and OE-style connection layout support accurate replacement service in compatible Volkswagen HVAC systems.