Nissens 999314 A/C Expansion Valve

Nissens A/C Expansion Valve for Audi HVAC Service

The Nissens 999314 A/C expansion valve is a block-style HVAC flow restrictor built with an aluminum body and R134A refrigerant compatibility. It is used in Audi climate control systems to regulate refrigerant flow through the evaporator circuit and maintain stable A/C performance.

Key Features

• Block-style A/C expansion valve for HVAC refrigerant control
• Aluminum construction for corrosion resistance and thermal stability
• Designed for R134A refrigerant systems
• Includes O-rings for sealing at the connection points
• Liquid inlet and outlet fitting thread diameter: 0.5500
• Suction inlet fitting thread diameter: 0.7900
• Suction outlet fitting thread diameter: 0.7100
• Direct replacement reference: Nissens 999314

Detailed Description

Nissens 999314 is an A/C expansion valve engineered for Audi HVAC systems that require a block-type refrigerant metering component. By controlling refrigerant delivery into the evaporator, it helps the air conditioning system maintain proper pressure balance and cooling output. This part cross-references UAC EX9755C for the same application. It is a practical replacement choice for Audi Q5, Audi A4, Audi A4 Quattro, Audi S4, Audi S5, Audi A5, and Audi A5 Quattro applications listed below.

Vehicle Fitment

• Fits 2015-2016 Audi Q5, N/A
• Fits 2009-2012 Audi Q5, N/A
• Fits 2014 Audi Q5, N/A, From 11/11/2013
• Fits 2009-2012 Audi A4, N/A
• Fits 2009-2012 Audi A4 Quattro, N/A
• Fits 2010-2012 Audi S4, N/A
• Fits 2008-2012 Audi S5, N/A
• Fits 2010-2011 Audi A5, N/A
• Fits 2008-2011 Audi A5 Quattro, N/A

Common Symptoms This Part Addresses

• Weak or inconsistent cabin cooling
• Improper refrigerant metering at the evaporator
• Erratic A/C pressure behavior
• Reduced HVAC system efficiency
• Leak-related service issues at the valve connection points

Installation Notes

Verify the refrigerant type before installation; this valve is specified for R134A systems. Confirm the block-style configuration, fitting thread diameters, and vehicle application before service. Replace the O-rings with proper HVAC sealing practices and evacuate and recharge the system according to factory procedures after installation.

Quality Assurance

Nissens develops thermal management components for aftermarket use with a focus on consistent manufacturing standards and application-specific fitment. The 999314 follows that approach for Audi HVAC service and is built as a replacement expansion valve for the listed vehicles.