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Four Seasons 39640 A/C Expansion Valve - Rear
| Brand | Four Seasons 39640 |
|---|---|
| Position | Rear |
| Material | Aluminum |
| Refrigerant Type | R134a |
| Type | Block type |
| Mounting Hole Quantity | 2 |
| Suction Inlet Fitting Gender | Female |
| Suction Outlet Fitting Gender | Female |
| Suction Inlet Fitting Thread Diameter | No. 12 |
| Suction Outlet Fitting Thread Diameter | No. 12 |
| Liquid Inlet Fitting Gender | Female |
| Liquid Outlet Fitting Gender | Female |
| Liquid Inlet Fitting Thread Diameter | No. 6 |
| Liquid Outlet Fitting Thread Diameter | No. 6 |
| Description | Expansion valves |
| Liquid Inlet Style | O-ring |
| Liquid Outlet Style | O-ring |
| Meets / Exceeds OEM? | Yes |
| Style | W/o solenoid |
| Suction Inlet Style | O-ring |
| Suction Outlet Style | O-ring |
| Super Heat | 8.000 |
| Switch Included? | Not included |
| Tonnage | 0.800 |
| Product line | Expansion Valve |
| Fits | Audi · 16 vehicles |
OE direct replacement. Meets OEM requirements for straightforward replacement.
Aluminum block type. Built with O-ring fittings for secure A/C flow control.
R134A compatible. Configured for this refrigerant and without a solenoid.
Cross-references Four Seasons 39640, UAC EX10725C and 4M0820181B for the same application. See all 4.
Four Seasons 39640 Expansion Valve
The Four Seasons 39640 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and O-ring inlet and outlet connections. It is an OE-style replacement that meets or exceeds OEM requirements for rear HVAC service on select Audi applications.
Key Features
- Part number 39640 from Four Seasons Expansion Valve line
- Block type A/C expansion valve for R134A refrigerant
- Aluminum construction for HVAC service applications
- Female suction and liquid fittings with O-ring seals
- No solenoid included
- 8.000 super heat setting
- 0.800 tonnage rating
- Meets or exceeds OEM specifications
Application Details
This expansion valve is used in rear HVAC systems on select Audi models, including Fits 2017-2023 Audi Q7, Rear, Fits 2021-2023 Audi RS Q8, Rear, Fits 2022 Audi Q8, Rear, Fits 2024-2025 Audi Q7, Rear, Fits 2024-2025 Audi Q8, Rear, and Fits 2025 Audi Q8 e-tron Sportback, Rear. If you are replacing a worn or restricted valve on an Audi Q7, Audi Q8, or Audi RS Q8 rear air conditioning circuit, Four Seasons 39640 is the direct-fit service part to verify against the original component.
This part cross-references UAC EX10725C for the same application.
What It Helps Fix
- Weak or inconsistent rear A/C cooling
- Refrigerant flow restriction at the expansion valve
- Incorrect evaporator feed in the rear HVAC circuit
- Temperature control issues caused by a failing valve
- Leak concerns at worn O-ring style connections
Installation Notes
Confirm the vehicle uses R134A refrigerant and a rear block-type expansion valve before installation. Match the suction and liquid fitting thread sizes, O-ring style connections, and mounting hole layout to the original part. Replace seals as needed during A/C service, evacuate and recharge the system to specification, and verify proper superheat and outlet temperature after installation.
Quality Assurance
Four Seasons 39640 is engineered as an OE-style replacement that meets or exceeds OEM requirements for the listed Audi rear HVAC applications. Four Seasons Expansion Valve parts are built for accurate refrigerant metering and service-fit consistency in automotive air conditioning repair.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 2025 | Audi | Q7 | Rear | Expansion Valve |
| 2025 | Audi | Q8 | Rear | Expansion Valve |
| 2025 | Audi | Q8 e-tron Sportback | Rear | Expansion Valve |
| 2024 | Audi | Q7 | Rear | Expansion Valve |
| 2024 | Audi | Q8 | Rear | Expansion Valve |
| 2023 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
| 2023 | Audi | RS Q8 | Rear | w/ R134a; Expansion Valve |
| 2022 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
| 2022 | Audi | Q8 | Rear | w/ R134a; Expansion Valve |
| 2022 | Audi | RS Q8 | Rear | w/ R134a; Expansion Valve |
| 2021 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
| 2021 | Audi | RS Q8 | Rear | w/ R134a; Expansion Valve |
| 2020 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
| 2019 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
| 2018 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
| 2017 | Audi | Q7 | Rear | w/ R134a; Expansion Valve |
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