Nissens 999415 A/C Expansion Valve
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Nissens

Nissens 999415 A/C Expansion Valve

Brand Nissens 999415
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 · 66 vehicles

Aluminum construction. Helps resist corrosion in demanding HVAC service.

Block type. A compact A/C expansion valve design for precise refrigerant flow control.

O-rings included. Comes ready for a cleaner, more complete installation.

Cross-references UAC EX10709C, 0998300600 and A0998300600 for the same application. See all 3.

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Nissens A/C Expansion Valve for Mercedes-Benz

The Nissens 999415 A/C expansion valve is a block-style HVAC flow restrictor built from aluminum for R134A systems. It is engineered for precise refrigerant metering in Mercedes-Benz applications, including AMG GT, G-Class, C-Class, E-Class, and GLC models.

  • Brand: Nissens
  • Part number: 999415
  • Aluminum construction
  • Block-type A/C expansion valve
  • Refrigerant type: R134A
  • Mounting hardware included
  • O-rings included
  • O-ring quantity: 4
  • Liquid inlet fitting thread diameter: 0.3500
  • Liquid outlet fitting thread diameter: 0.4700
  • Suction inlet fitting thread diameter: 0.7100
  • Suction outlet fitting thread diameter: 0.7100

Fitment Coverage

  • Fits 2021-2022 Mercedes-Benz AMG GT 43, N/A.
  • Fits 2022 Mercedes-Benz AMG GT 53, N/A. Notes: Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm.
  • Fits 2019-2021 Mercedes-Benz AMG GT 53, N/A.
  • Fits 2019-2021 Mercedes-Benz AMG GT 63, N/A.
  • Fits 2019-2021 Mercedes-Benz AMG GT 63 S, N/A.
  • Fits 2019-2021 Mercedes-Benz G550, N/A.
  • Fits 2019-2021 Mercedes-Benz G63 AMG, N/A.
  • Fits 2017-2018 Mercedes-Benz C300, N/A.
  • Fits 2017-2018 Mercedes-Benz C350e, N/A.
  • Fits 2017-2018 Mercedes-Benz C43 AMG, N/A.
  • Fits 2017-2018 Mercedes-Benz C63 AMG, N/A.
  • Fits 2017-2018 Mercedes-Benz C63 AMG S, N/A.
  • Fits 2017-2018 Mercedes-Benz E300, N/A.
  • Fits 2018 Mercedes-Benz E400, N/A.
  • Fits 2017-2018 Mercedes-Benz E43 AMG, N/A.
  • Fits 2018 Mercedes-Benz E63 AMG S, N/A.
  • Fits 2017-2018 Mercedes-Benz GLC300, N/A.
  • Fits 2017-2018 Mercedes-Benz GLC43 AMG, N/A.

What This Part Helps Correct

  • Uneven refrigerant flow through the A/C system
  • Weak cabin cooling performance
  • Incorrect evaporator feed control
  • Pressure-related A/C performance issues
  • Leaks at the valve connection points when seals are worn

Installation Notes

Verify the vehicle’s refrigerant system uses R134A before installation. Confirm the inlet and outlet dimensions against the original valve, especially on the 2022 Mercedes-Benz AMG GT 53 application with listed port measurements. Replace the O-rings during service and inspect the mating surfaces for contamination or damage before reassembly. This part cross-references UAC EX10709C and OE numbers 0998300600, A0998300600 for the same application.

Quality Assurance

Nissens develops and manufactures thermal management components to consistent production standards, with a focus on aftermarket fit and function. Part number 999415 is built as a direct-service HVAC component for Mercedes-Benz A/C repair work.

Related reading

This part fits 66 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersFuel TypeNotes
2025Mercedes-BenzAMG GT 434Matic+3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2025Mercedes-BenzAMG GT 53Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2025Mercedes-BenzG550Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2025Mercedes-BenzG580Edition ONE-L--BATTERY EV (EV/BEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2025Mercedes-BenzG63 AMGBase4.0LV8MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2024Mercedes-BenzAMG GT 43Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2024Mercedes-BenzAMG GT 53Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2024Mercedes-BenzG550Base4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2024Mercedes-BenzG63 4x4 Squared AMGBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2024Mercedes-BenzG63 AMGBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzAMG GT 43Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzAMG GT 53Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzAMG GT 63Base4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzAMG GT 63 SBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzE63 AMG S4Matic4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzG550Base4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzG63 4x4 Squared AMGBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2023Mercedes-BenzG63 AMGBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2022Mercedes-BenzAMG GT 43Base3.0LL6ELECTRIC/GAS—
2022Mercedes-BenzAMG GT 53Base3.0LL6MILD HYBRID EV-GAS (MHEV)Inlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2022Mercedes-BenzG550Base4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2022Mercedes-BenzG63 4x4 Squared AMGBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2022Mercedes-BenzG63 AMGBase4.0LV8GASInlet 1: 35.5mm, Inlet 2: 30 mm, Outlet 1: 11.8 mm, Outlet 2: 17.7 mm
2021Mercedes-BenzAMG GT 43Base3.0LL6ELECTRIC/GAS—
2021Mercedes-BenzAMG GT 53Base3.0LL6ELECTRIC/GAS—
2021Mercedes-BenzAMG GT 63Base4.0LV8GAS—
2021Mercedes-BenzAMG GT 63 SBase4.0LV8GAS—
2021Mercedes-BenzG550Base4.0LV8GAS—
2021Mercedes-BenzG63 AMGBase4.0LV8GAS—
2020Mercedes-BenzAMG GT 53Base3.0LL6ELECTRIC/GAS—
2020Mercedes-BenzAMG GT 63Base4.0LV8GAS—
2020Mercedes-BenzAMG GT 63 SBase4.0LV8GAS—
2020Mercedes-BenzG550Base4.0LV8GAS—
2020Mercedes-BenzG63 AMGBase4.0LV8GAS—
2019Mercedes-BenzAMG GT 53Base3.0LL6ELECTRIC/GAS—
2019Mercedes-BenzAMG GT 63Base4.0LV8GAS—
2019Mercedes-BenzAMG GT 63 SBase4.0LV8GAS—
2019Mercedes-BenzG550Base4.0LV8GAS—
2019Mercedes-BenzG63 AMGBase4.0LV8GAS—
2018Mercedes-BenzC3004Matic2.0LL4GAS—
2018Mercedes-BenzC300Base2.0LL4GAS—
2018Mercedes-BenzC350eBase2.0LL4ELECTRIC/GAS—
2018Mercedes-BenzC43 AMG4Matic3.0LV6GAS—
2018Mercedes-BenzC63 AMGBase4.0LV8GAS—
2018Mercedes-BenzC63 AMG SBase4.0LV8GAS—
2018Mercedes-BenzE3004Matic2.0LL4GAS—
2018Mercedes-BenzE300Base2.0LL4GAS—
2018Mercedes-BenzE4004Matic3.0LV6GAS—
2018Mercedes-BenzE400Base3.0LV6GAS—
2018Mercedes-BenzE43 AMG4Matic3.0LV6GAS—
2018Mercedes-BenzE63 AMG S4Matic4.0LV8GAS—
2018Mercedes-BenzGLC300Base2.0LL4GAS—
2018Mercedes-BenzGLC3004Matic2.0LL4GAS—
2018Mercedes-BenzGLC43 AMG4Matic3.0LV6GAS—
2017Mercedes-BenzC300Base2.0LL4GAS—
2017Mercedes-BenzC3004Matic2.0LL4GAS—
2017Mercedes-BenzC350eBase2.0LL4ELECTRIC/GAS—
2017Mercedes-BenzC43 AMG4Matic3.0LV6GAS—
2017Mercedes-BenzC63 AMGBase4.0LV8GAS—
2017Mercedes-BenzC63 AMG SBase4.0LV8GAS—
2017Mercedes-BenzE3004Matic2.0LL4GAS—
2017Mercedes-BenzE300Base2.0LL4GAS—
2017Mercedes-BenzE43 AMG4Matic3.0LV6GAS—
2017Mercedes-BenzGLC3004Matic2.0LL4GAS—
2017Mercedes-BenzGLC300Base2.0LL4GAS—
2017Mercedes-BenzGLC43 AMG4Matic3.0LV6GAS—
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
UAC — EX10709C0998300600A0998300600