Nissens 999364 A/C Expansion Valve

Nissens A/C Expansion Valve for Mercedes-Benz

The Nissens 999364 A/C expansion valve regulates refrigerant flow through the air conditioning system to help maintain stable cooling performance. Built from aluminum and configured for R134A systems, it is a direct-fit HVAC flow restrictor for select Mercedes-Benz applications.

• Aluminum block-style A/C expansion valve
• Designed for R134A refrigerant systems
• Includes mounting hardware and O-rings
• O-ring seals included for service-ready installation
• Cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application

Fitment and Application Details

Fits 2015 Mercedes-Benz C400, N/A. Fits 2015-2016 Mercedes-Benz C300, N/A. Fits 2015-2016 Mercedes-Benz C63 AMG S, N/A. Fits 2016 Mercedes-Benz C350e, N/A. Fits 2016 Mercedes-Benz C450 AMG, N/A. Fits 2016 Mercedes-Benz C63 AMG, N/A. Fits 2016 Mercedes-Benz GLC300, N/A. This Nissens 999364 expansion valve is used in Mercedes-Benz HVAC systems that require precise refrigerant metering for R134A service.

What This Part Helps Address

• Weak or inconsistent cabin cooling
• Improper refrigerant flow through the evaporator circuit
• Temperature fluctuations from a restricted or worn valve
• A/C performance issues after HVAC service
• Leaks at the valve connection points when seals are degraded

Installation Notes

Verify refrigerant type, port configuration, and OE cross-reference before installation. Replace the O-rings during service, inspect the mating surfaces for wear or contamination, and evacuate and recharge the system according to Mercedes-Benz service procedures. The block design and threaded fittings should be matched carefully to the original HVAC layout.

Quality Assurance

Nissens develops and manufactures thermal management components to consistent quality standards across its aftermarket range. Part number 999364 is built as a service replacement for select Mercedes-Benz C-Class and GLC applications.