/live/media/FS/FS_39661_Ang.jpg)
Four Seasons 39661 A/C Expansion Valve - Rear
| Brand | Four Seasons 39661 |
|---|---|
| Position | Rear |
| Description | Expansion Valves |
| Liquid Inlet Fitting Gender | Female |
| Liquid Inlet Fitting Thread Diameter | No. 6 |
| Liquid Inlet Style | O-Ring |
| Liquid Outlet Fitting Gender | Female |
| Liquid Outlet Fitting Thread Diameter | No. 8 |
| Liquid Outlet Style | O-Ring |
| Material | Aluminum |
| Meets / Exceeds OEM? | Yes |
| Mounting Hole Quantity | 2 |
| Refrigerant Type | R134A |
| Style | w/o Solenoid |
| Suction Inlet Fitting Gender | Female |
| Suction Inlet Fitting Thread Diameter | No. 12 |
| Suction Inlet Style | O-Ring |
| Suction Outlet Fitting Gender | Female |
| Suction Outlet Fitting Thread Diameter | No. 12 |
| Suction Outlet Style | O-Ring |
| Super Heat | -0.8 |
| Switch Included? | Not Included |
| Tonnage | 1.500 |
| Type | Block Type |
| Product line | Expansion Valve |
| Fits | Lexus · 6 vehicles |
OE direct replacement. Meets OEM requirements for a straightforward replacement.
Aluminum block type. Uses O-ring fittings for a secure, leak-resistant seal.
R134A compatible. Built for use with R134A refrigerant systems.
Cross-references Four Seasons 39661, 759882 and 8851548160 for the same application. See all 5.
Four Seasons 39661 Expansion Valve
Four Seasons 39661 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and O-ring connections for the liquid and suction lines. It is an OE-style replacement for rear HVAC service on select Lexus RX models, including Lexus RX350, Lexus RX350L, Lexus RX450h, and Lexus RX450hL applications.
Key Features
- Brand: Four Seasons Expansion Valve
- Part number: 39661
- Block type A/C expansion valve
- Aluminum construction
- R134A refrigerant type
- Female O-ring fittings on suction and liquid ports
- 2 mounting holes
- Meets or exceeds OEM requirements
- Style: w/o solenoid
- Tonnage: 1.500
Product Details
This Four Seasons expansion valve meters refrigerant flow into the evaporator to help maintain proper system pressure and temperature control. The valve uses No. 12 female suction inlet and outlet threads, No. 6 liquid inlet threads, and No. 8 liquid outlet threads, with O-ring sealing surfaces for service-friendly installation in R134A-equipped HVAC systems. It is a direct-fit replacement for rear A/C service on 2018-2019 Lexus RX350, 2018-2019 Lexus RX350L, 2019 Lexus RX450h, and 2019 Lexus RX450hL. This part cross-references OE-style numbers such as 759882 and 8851548160 for the same application.
Common Issues This Part Can Address
- Rear A/C cooling that is weak or inconsistent
- Refrigerant flow that is not being metered correctly
- Evaporator performance problems caused by a restricted valve
- Temperature control issues in the rear HVAC circuit
- Service replacement for a leaking or worn expansion valve
Installation Notes and Tips
Verify the vehicle uses an R134A rear HVAC setup before installation. Inspect the O-rings, mating surfaces, and adjacent A/C components for wear or contamination, and replace any damaged seals during service. Confirm the port sizes and mounting pattern match the original valve before reassembly. After installation, evacuate and recharge the system according to factory specifications and check for leaks and proper vent temperatures.
Quality Assurance
Four Seasons supplies HVAC service parts built to meet or exceed OEM specifications, and this expansion valve follows that standard for fit and function on the listed Lexus applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2019 | Lexus | RX350 | Rear | Expansion Valve |
| 2019 | Lexus | RX350L | Rear | Expansion Valve |
| 2019 | Lexus | RX450h | Rear | Expansion Valve |
| 2019 | Lexus | RX450hL | Rear | Expansion Valve |
| 2018 | Lexus | RX350 | Rear | Expansion Valve |
| 2018 | Lexus | RX350L | Rear | Expansion Valve |
| No rows match your filter. | ||||