Four Seasons 39681 A/C Expansion Valve - Front

Four Seasons 39681 Expansion Valve for Lexus RX

Four Seasons 39681 is a block-type A/C expansion valve built for R134A systems and engineered with an aluminum body for consistent refrigerant control. It is a direct-fit HVAC flow restrictor for select Lexus RX front A/C applications, including RX350, RX350L, RX450h, and RX450hL models.

Key Features

• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction for HVAC service applications
• Liquid inlet: No. 6 O-ring
• Liquid outlet: No. 10 O-ring
• Suction inlet: No. 12 O-ring
• Suction outlet: No. 12 O-ring
• Meets or exceeds OEM requirements
• Mounting hardware included
• Style: without solenoid
• Super heat setting: -6.000
• Tonnage: 1

Product Details

The Four Seasons Expansion Valve line is focused on replacement HVAC components that match OE-style service needs for mobile air conditioning systems. Part number 39681 is designed for front A/C service on 2018-2022 Lexus RX applications and uses O-ring connections for the liquid and suction lines. This Four Seasons 39681 valve helps regulate refrigerant flow through the evaporator circuit, supporting proper system operation in R134A-equipped vehicles.

This part cross-references 217697 and 885150E150 for the same application.

What It Helps Address

• Weak or inconsistent cabin cooling
• Improper refrigerant metering at the evaporator
• Front A/C performance issues in Lexus RX models
• Leak concerns at worn O-ring connection points
• HVAC service needs after expansion valve failure

Installation Notes

Verify refrigerant type, line sizes, and O-ring sealing surfaces before installation. Replace damaged seals, evacuate the system, and recharge with the correct R134A specification after service. Confirm front-position fitment for 2018-2022 Lexus RX350, RX350L, RX450h, and RX450hL applications before ordering.

Quality Assurance

Four Seasons states that its HVAC products are engineered and tested for long service life, drawing on more than 50 years of mobile A/C experience. Part number 39681 is built to meet or exceed OEM requirements for the listed Lexus RX front applications.