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Nissens 999391 A/C Expansion Valve - Front
| Brand | Nissens 999391 |
|---|---|
| Position | Front |
| Material | Aluminum |
| Refrigerant Type | R134a |
| Type | Block |
| Mounting Hardware Included | Yes |
| Liquid Inlet Fitting Thread Diameter | 0.3500 |
| Liquid Outlet Fitting Thread Diameter | 0.4700 |
| O-ring Quantity | 4 |
| O-rings Included | Yes |
| Suction Inlet Fitting Thread Diameter | 0.7100 |
| Suction Outlet Fitting Thread Diameter | 0.7100 |
| Fits | Mercedes-Benz · 6 vehicles |
Aluminum block design. Built for R134A systems with included O-rings and mounting hardware.
A/C expansion valve. Regulates refrigerant flow for efficient cooling performance.
Genuine Nissens Quality. Developed and manufactured to exacting standards.
Cross-references 0008351600 and A0008351600 for the same application. See all 2.
Nissens A/C Expansion Valve 999391
Nissens 999391 is a block-style A/C expansion valve built for R134A systems and made from aluminum for consistent refrigerant control. It is a direct-fit thermal management component for the front HVAC system on select Mercedes-Benz Metris models.
Key Features
- Block-style A/C expansion valve for refrigerant metering
- Aluminum construction for HVAC service durability
- Configured for R134A refrigerant systems
- Includes mounting hardware and O-rings
- Liquid and suction port dimensions match the listed application
- Fits 2016-2021 Mercedes-Benz Metris, front, excluding automatic temperature controls
Application Details
This Nissens A/C expansion valve 999391 regulates refrigerant flow into the evaporator to help maintain proper cooling performance in the HVAC system. It is listed for 2016-2021 Mercedes-Benz Metris front applications and is the correct choice for vehicles without automatic temperature controls. This part cross-references Monroe Shocks & Struts (e.g., 0008351600, A0008351600) for the same application.
What It Helps Address
- Weak or inconsistent cabin cooling
- Improper refrigerant metering at the evaporator
- HVAC performance issues tied to a worn expansion valve
- Front A/C system service on Mercedes-Benz Metris models
- R134A system repair after contamination or component wear
Installation Notes
Verify the vehicle uses the listed front application and does not have automatic temperature controls before installation. Confirm refrigerant type, port dimensions, and O-ring sealing surfaces during service. Replace the valve during proper A/C system repair procedures, evacuate and recharge the system to specification, and inspect related HVAC components for contamination or restriction.
Quality Assurance
Nissens develops and manufactures thermal management components to controlled quality standards across its aftermarket range. Part number 999391 is built to support reliable A/C system service on the specified Mercedes-Benz Metris applications.
| Year | Make | Model | Submodel | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2021 | Mercedes-Benz | Metris | Base | 2.0L | L4 | GAS | Front | Exc.Automatic Temperature Controls |
| 2020 | Mercedes-Benz | Metris | Base | 2.0L | L4 | GAS | Front | Exc.Automatic Temperature Controls |
| 2019 | Mercedes-Benz | Metris | Base | 2.0L | L4 | GAS | Front | Exc.Automatic Temperature Controls |
| 2018 | Mercedes-Benz | Metris | Base | 2.0L | L4 | GAS | Front | Exc.Automatic Temperature Controls |
| 2017 | Mercedes-Benz | Metris | Base | 2.0L | L4 | GAS | Front | Exc.Automatic Temperature Controls |
| 2016 | Mercedes-Benz | Metris | Base | 2.0L | L4 | GAS | Front | Exc.Automatic Temperature Controls |
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