Nissens 999393 A/C Expansion Valve

Nissens A/C Expansion Valve for Mercedes-Benz

The Nissens 999393 A/C expansion valve regulates refrigerant flow in the air conditioning system to support proper evaporator performance and cabin cooling. Built from aluminum and configured for R134A systems, it is a direct-fit HVAC flow restrictor for select Mercedes-Benz compact models.

Compatible with Mercedes-Benz GLA250, CLA250, CLA45 AMG, GLA45 AMG, B250e, and B Electric Drive applications, this Nissens expansion valve is built for vehicles that use a block-style valve layout. The part number 999393 is also a useful reference when matching the correct replacement for the original unit.

• Aluminum construction for HVAC service applications
• Block-style A/C expansion valve design
• Configured for R134A refrigerant systems
• Mounting hardware included
• O-rings included and ready for replacement service
• Direct replacement reference for part number 999393

Detailed Product Information

Nissens 999393 is an A/C expansion valve used to meter liquid refrigerant into the evaporator under the correct operating conditions. It features aluminum construction, a block type body, and fitting thread diameters that match the specified Mercedes-Benz HVAC applications. This part cross-references Monroe Shocks & Struts (e.g., 24683600084, A24683600084) for the same application. For shoppers searching Mercedes-Benz GLA250 A/C expansion valve, CLA250 HVAC flow restrictor, or 2014-2019 Mercedes-Benz CLA45 AMG expansion valve, this part number provides a focused replacement option.

What It Helps Fix

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance issues caused by a worn or restricted valve
• Temperature fluctuations during compressor operation
• Service repairs requiring a replacement Mercedes-Benz expansion valve

Installation Notes and Tips

Verify refrigerant type, valve style, and fitting dimensions before installation. Replace the O-rings during service, inspect the surrounding A/C lines for contamination or damage, and evacuate and recharge the system according to factory procedures after installation. Confirm the vehicle application against the original part number 999393 before final assembly.

Quality Assurance

Nissens develops and manufactures thermal management components to consistent production standards, with product development aligned to changing aftermarket technology. The 999393 expansion valve reflects that approach through application-specific fitment and OE-style service readiness for Mercedes-Benz HVAC repairs.