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Four Seasons 39540 A/C Expansion Valve
| Brand | Four Seasons 39540 |
|---|---|
| Color | Aluminum |
| Description | Expansion Valves |
| Liquid Inlet Fitting Gender | Female |
| Liquid Inlet Fitting Thread Diameter | No. 6 |
| Liquid Inlet Size IN | 0.34 |
| Liquid Inlet Size MM | 8.6 |
| Liquid Inlet Style | Sealing Washer |
| Liquid Inlet Thread Type | Not Threaded |
| Liquid Inlet Type | Sealing Washer |
| Liquid Outlet Fitting Gender | Female |
| Liquid Outlet Fitting Thread Diameter | No. 8 |
| Liquid Outlet Style | Sealing Washer |
| Liquid Outlet Thread Type | Not Threaded |
| Liquid Outlet Type | Sealing Washer |
| Lqd Out Size IN | 0.46 |
| Lqd Out Size MM | 11.8 |
| Material | Aluminum |
| Meets / Exceeds OEM? | Yes |
| Mounting Hole Quantity | 2 |
| Refrigerant Type | R134A |
| Style | w/o Solenoid |
| Suc In Size IN | 0.63 |
| Suc In Size MM | 16 |
| Suc Out Size IN | 0.700 |
| Suc Out Size MM | 17.7 |
| Suction Inlet Fitting Gender | Female |
| Suction Inlet Fitting Thread Diameter | No. 10 |
| Suction Inlet Style | Sealing Washer |
| Suction Inlet Thread Type | Not Threaded |
| Suction Inlet Type | Sealing Washer |
| Suction Outlet Fitting Gender | Female |
| Suction Outlet Fitting Thread Diameter | No. 12 |
| Suction Outlet Style | Sealing Washer |
| Suction Outlet Thread Type | Not Threaded |
| Suction Outlet Type | Sealing Washer |
| Super Heat | -9.0 |
| Switch Included? | Not Included |
| Tonnage | 1.5 |
| Type | Block Type |
| Product line | Expansion Valve |
| Fits | Ford · 15 vehicles |
OE direct replacement. Meets or exceeds OEM requirements for dependable service.
Aluminum construction. Lightweight material helps resist corrosion in the A/C system.
Block type design. Built as an expansion valve for precise refrigerant flow control.
Cross-references Four Seasons 39540, Global Parts Distributors LLC 3411615 and 217540 for the same application. See all 13.
Four Seasons 39540 Expansion Valve for Mustang A/C Service
Restore refrigerant control in the air conditioning system with the Four Seasons Expansion Valve, part number 39540. This block-type A/C expansion valve is built for R134A systems and is listed for Ford Mustang applications from 2015-2023, including 2018-2021 Mustang models with R134a.
Key Features
- Four Seasons Expansion Valve, part number 39540
- Block type A/C expansion valve for HVAC flow restriction control
- Aluminum construction with aluminum finish
- R134A refrigerant type
- Style: w/o solenoid
- Meets or exceeds OEM requirements
- 1.5 tonnage rating
- Super heat setting: -9.0
- Female suction and liquid fittings with sealing washer connections
- Mounting hole quantity: 2
Product Details
The Four Seasons 39540 expansion valve regulates refrigerant flow into the evaporator to support proper A/C system operation in Ford Mustang HVAC systems. It uses female suction and liquid inlet and outlet fittings with sealing washer interfaces, and its block-type aluminum design is specified for R134A service. This part cross-references Global Parts Distributors LLC 3411615 for the same application.
Compatible With Ford Mustang A/C systems across 2015-2017 Mustang, 2018-2021 Mustang with R134a, and 2022-2023 Mustang expansion valve applications. The Four Seasons 39540 is also referenced under OE-style numbers including FR3Z19849B and FR3Z19849C.
Common Replacement Reasons
- Weak or inconsistent cabin cooling
- Incorrect refrigerant metering at the evaporator
- A/C performance changes during load or temperature swings
- Leaking or worn expansion valve sealing surfaces
- Service replacement for R134A Mustang HVAC repairs
Installation Notes
Verify refrigerant type, fitting sizes, and mounting points before installation. This valve uses sealing washer connections and a block-style layout, so the mating surfaces should be clean and properly seated during service. Confirm the vehicle is equipped for R134A and match the application to the correct Mustang model year range before reassembly.
Quality Assurance
Four Seasons lists this expansion valve as meeting or exceeding OEM requirements, making it a direct-fit service part for confirmed Mustang applications.
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2023 | Ford | Mustang | — | 2.3L | L4 | N/A | Expansion Valve |
| 2022 | Ford | Mustang | — | 2.3L | L4 | N/A | Expansion Valve |
| 2021 | Ford | Mustang | — | 5.0L | V8 | N/A | w/ R134a; Expansion Valve |
| 2021 | Ford | Mustang | — | 2.3L | L4 | N/A | w/ R134a; Expansion Valve |
| 2020 | Ford | Mustang | — | 5.0L | V8 | N/A | w/ R134a; Expansion Valve |
| 2020 | Ford | Mustang | — | 2.3L | L4 | N/A | w/ R134a; Expansion Valve |
| 2019 | Ford | Mustang | — | 5.0L | V8 | N/A | w/ R134a; Expansion Valve |
| 2019 | Ford | Mustang | — | 2.3L | L4 | N/A | w/ R134a; Expansion Valve |
| 2018 | Ford | Mustang | GT | — | — | N/A | w/ R134a; Expansion Valve |
| 2018 | Ford | Mustang | EcoBoost | — | — | N/A | w/ R134a; Expansion Valve |
| 2018 | Ford | Mustang | GT Premium | — | — | N/A | w/ R134a; Expansion Valve |
| 2018 | Ford | Mustang | EcoBoost Premium | — | — | N/A | w/ R134a; Expansion Valve |
| 2017 | Ford | Mustang | — | 2.3L | L4 | N/A | Expansion Valve |
| 2016 | Ford | Mustang | — | 2.3L | L4 | N/A | Expansion Valve |
| 2015 | Ford | Mustang | — | 2.3L | L4 | N/A | Expansion Valve |
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