Nissens 999394 A/C Expansion Valve - Front

Nissens A/C Expansion Valve for Mercedes-Benz

Nissens part number 999394 is an aluminum block-style A/C expansion valve for Mercedes-Benz HVAC systems using R134A refrigerant. It is built for precise refrigerant metering in front-mounted applications and is listed for multiple ML, GL, and R-Class models.

For Mercedes-Benz ML550, GL450, GL550, and related applications, this Nissens A/C expansion valve 999394 supports stable evaporator feed control and OE-style service replacement. It also cross-references Genuine 1648300084 for the same application.

Key Features

• Aluminum block-style A/C expansion valve
• Designed for R134A refrigerant systems
• Includes mounting hardware
• O-rings included; 4 O-rings listed
• Liquid and suction inlet/outlet thread dimensions listed for application matching
• Direct replacement format for select Mercedes-Benz HVAC systems

Detailed Product Description

Nissens 999394 is an HVAC flow restrictor in expansion valve form, used to regulate refrigerant flow into the evaporator. The aluminum construction supports durability in under-hood A/C service, while the block design matches the listed Mercedes-Benz applications. This part is specified for R134A systems and is intended for vehicles such as the Mercedes-Benz ML350, ML550, GL350, GL450, GL550, R350, and related models listed below.

Nissens develops thermal management components with a focus on aftermarket fit and function, and this part reflects that approach with application-specific dimensions and OE cross-reference support. If you are replacing a Mercedes-Benz A/C expansion valve on a 2006-2014 ML-Class, GL-Class, or R-Class vehicle, part number 999394 is a relevant service part to verify against the original unit.

Vehicle Fitment

• Fits 2008-2014 Mercedes-Benz ML550, N/A
• Fits 2010-2012 Mercedes-Benz GL350, Front
• Fits 2007-2012 Mercedes-Benz GL450, Front
• Fits 2008-2012 Mercedes-Benz GL550, Front
• Fits 2008-2012 Mercedes-Benz R350, Front
• Fits 2006-2011 Mercedes-Benz ML350, N/A
• Fits 2010-2011 Mercedes-Benz ML450, N/A
• Fits 2007-2011 Mercedes-Benz ML63 AMG, N/A
• Fits 2007-2009 Mercedes-Benz GL320, Front
• Fits 2007-2009 Mercedes-Benz ML320, N/A
• Fits 2007-2009 Mercedes-Benz R320, Front
• Fits 2006-2007 Mercedes-Benz ML500, N/A
• Fits 2007 Mercedes-Benz R63 AMG, Front

Installation Notes

Verify the original valve style, refrigerant type, and fitting dimensions before installation. Replace the listed O-rings during service, inspect the surrounding A/C lines and seals, and evacuate and recharge the system according to Mercedes-Benz service procedures after replacement.

Quality Assurance

Nissens positions this component within its Genuine Nissens Quality range, with products developed and manufactured to consistent quality standards for aftermarket thermal management service.