Nissens 999375 A/C Expansion Valve

Nissens A/C Expansion Valve for Audi HVAC Service

The Nissens 999375 A/C expansion valve is a block-style refrigerant flow restrictor built for Audi HVAC systems using R134A refrigerant. It is an aluminum replacement part with included O-rings for a cleaner service fit on select Audi A4, A5, allroad, Q5, S4, S5, SQ5, and RS5 applications.

Key Features

• Block-style A/C expansion valve for HVAC refrigerant control
• Aluminum construction for use in automotive air conditioning service
• Configured for R134A refrigerant systems
• O-rings included for sealing at installation
• Direct replacement for Audi OE references 8E0820679 and 8E0820679A
• Part number 999375 for catalog and fitment verification

Product Details

Nissens 999375 is an A/C expansion valve used to regulate refrigerant flow in the air conditioning circuit. This block-type valve is specified for R134A systems and uses aluminum construction with the correct inlet and outlet thread dimensions for the listed Audi applications. Nissens develops thermal management components for aftermarket service, and this part reflects that focus with application-specific fitment for Audi A4, Audi A5, Audi allroad, Audi Q5, Audi S4, Audi S5, Audi SQ5, and Audi RS5 models. If you are replacing a worn Audi A/C expansion valve, 999375 provides a direct-service option for the listed vehicles.

This part cross-references OE numbers 8E0820679 and 8E0820679A for the same application.

What It Helps Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering through the evaporator circuit
• A/C performance issues caused by a restricted or failing expansion valve
• Refrigerant sealing concerns at the valve connection points
• Service replacement needs on Audi R134A HVAC systems

Installation Notes and Tips

• Verify the vehicle uses R134A refrigerant before installation.
• Confirm the OE reference and thread dimensions against the removed part.
• Replace the included O-rings during service and lubricate them with the correct refrigerant oil.
• Inspect the A/C system for contamination, leaks, or compressor debris before reassembly.
• Evacuate and recharge the system according to factory service procedures after installation.

Quality Assurance

Nissens positions this part within its Genuine Nissens Quality standard, with development and manufacturing focused on thermal management components for the aftermarket. Part number 999375 is built for the listed Audi applications and OE cross-reference numbers.

Compatible With 2012-2014 Audi A5, 2013-2016 Audi A4, 2013-2016 Audi A4 Quattro, 2013-2016 Audi A5 Quattro, 2013-2016 Audi allroad, 2013-2016 Audi Q5, 2013-2016 Audi S4, 2012-2016 Audi S5, 2015-2016 Audi SQ5, and 2013-2015 Audi RS5. Fits 2017 Audi A5 Quattro, 2017 Audi Q5, 2017 Audi S5, and 2017 Audi SQ5, R134A refrigerant.