/live/media/FS/FS_39603_Fro.jpg)
Four Seasons 39603 A/C Expansion Valve - Front
| Brand | Four Seasons 39603 |
|---|---|
| Position | Front |
| Description | Expansion Valves |
| Liquid Inlet Fitting Gender | Female |
| Liquid Inlet Fitting Thread Diameter | No. 6 |
| Liquid Inlet Style | O-Ring |
| Liquid Inlet Thread Type | Not Threaded |
| Liquid Inlet Type | O-Ring |
| Liquid Outlet Fitting Gender | Female |
| Liquid Outlet Fitting Thread Diameter | No. 8 |
| Liquid Outlet Style | O-Ring |
| Liquid Outlet Thread Type | Not Threaded |
| Liquid Outlet Type | 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. 10 |
| Suction Inlet Style | O-Ring |
| Suction Inlet Thread Type | Not Threaded |
| Suction Inlet Type | O-Ring |
| Suction Outlet Fitting Gender | Female |
| Suction Outlet Fitting Thread Diameter | No. 10 |
| Suction Outlet Style | O-Ring |
| Suction Outlet Thread Type | Not Threaded |
| Suction Outlet Type | O-Ring |
| Super Heat | -4.0 |
| Switch Included? | Not Included |
| Tonnage | 1.500 |
| Type | Block Type |
| Product line | Expansion Valve |
| Fits | Toyota · 7 vehicles |
OE direct replacement. Meets or exceeds OEM requirements for dependable fit and function.
Aluminum construction. Lightweight material resists corrosion in demanding HVAC service.
Block type design. Uses O-ring connections and no-solenoid operation for straightforward flow control.
Cross-references Four Seasons 39603, UAC EX10679C and 217618 for the same application. See all 6.
Four Seasons 39603 Expansion Valve for Toyota HVAC Service
Four Seasons 39603 is a block-type A/C expansion valve built for R134A systems and aluminum HVAC components. It is an OE-style replacement that meets or exceeds OEM requirements and is listed for Toyota Sequoia and Toyota Tundra applications.
Key Features
- Brand: Four Seasons Expansion Valve
- Part number: 39603
- Block-type A/C expansion valve for R134A refrigerant
- Aluminum construction
- O-ring inlet and outlet connections
- Female suction and liquid fittings
- Mounting hole quantity: 2
- Style: w/o solenoid
- Super heat: -4.0
- Tonnage: 1.500
- Meets or exceeds OEM specifications
Product Details
This Four Seasons expansion valve regulates refrigerant flow into the evaporator to support proper A/C system operation. The block-style design uses No. 10 suction inlet and outlet threads, with No. 6 liquid inlet and No. 8 liquid outlet thread diameters, all in O-ring style connections for service-friendly sealing. Four Seasons 39603 is listed for 2018-2021 Toyota Tundra and 2020-2022 Toyota Sequoia front A/C service, making it a direct-fit choice for common Toyota HVAC repairs. This part cross-references UAC EX10679C for the same application.
Common Repair Symptoms
- Weak or inconsistent cabin cooling
- Incorrect refrigerant metering at the evaporator
- Frosting or temperature swings in the A/C system
- Compressor cycling caused by flow restriction issues
- HVAC performance loss after expansion valve wear or contamination
Installation Notes
Verify refrigerant type, port orientation, and mounting-hole alignment before installation. Replace damaged O-rings and evacuate and recharge the system according to factory service procedures after the repair. Confirm the vehicle application by year, model, and position: Fits 2018-2021 Toyota Tundra, N/A; Fits 2020-2022 Toyota Sequoia, Front.
Quality Assurance
Four Seasons 39603 is engineered to meet or exceed OEM requirements for fit and function in the listed Toyota applications. The aluminum, O-ring, block-type design supports consistent service replacement for R134A HVAC systems.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2022 | Toyota | Sequoia | — | — | Front | Expansion Valve |
| 2021 | Toyota | Sequoia | — | — | Front | Expansion Valve |
| 2021 | Toyota | Tundra | — | — | N/A | Expansion Valve |
| 2020 | Toyota | Sequoia | — | — | Front | Expansion Valve |
| 2020 | Toyota | Tundra | — | — | N/A | Expansion Valve |
| 2019 | Toyota | Tundra | 5.7L | V8 | N/A | Expansion Valve |
| 2018 | Toyota | Tundra | 5.7L | V8 | N/A | Expansion Valve |
| No rows match your filter. | ||||||