Nissens 999379 A/C Expansion Valve

Nissens A/C Expansion Valve for BMW Z4

The Nissens 999379 A/C expansion valve is a direct-fit HVAC flow restrictor for select BMW Z4 applications from 2009-2016. Built from aluminum and specified for R134A refrigerant systems, it helps regulate refrigerant flow through the air conditioning circuit for stable cooling performance.

Key Features

• Fits 2009-2016 BMW Z4, N/A
• Part number: 999379
• Aluminum construction for HVAC service applications
• Designed for R134A refrigerant systems
• Block-style expansion valve design
• O-rings included; 4 O-ring quantity listed
• Liquid inlet thread diameter: 0.5500
• Liquid outlet thread diameter: 0.6300
• Suction inlet thread diameter: 0.7100
• Suction outlet thread diameter: 0.7100

Detailed Description

This Nissens A/C expansion valve is engineered for BMW Z4 models covering 2009 through 2016 and is identified by part number 999379. As a block-type valve, it meters refrigerant entering the evaporator so the HVAC system can maintain proper cooling balance under R134A operation. Nissens develops thermal management components to OE-level specifications, and this replacement valve follows that approach with aluminum construction and included O-rings for service-ready sealing.

This part cross-references BMW 64119210754 for the same application. If you are searching for a BMW Z4 A/C expansion valve, BMW Z4 HVAC flow restrictor, or a 2009-2016 BMW Z4 air conditioning expansion valve replacement, this Nissens unit matches the listed fitment and refrigerant type.

What It Helps Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance issues caused by a worn expansion valve
• Refrigerant leaks at valve sealing points
• Service needs on BMW Z4 R134A HVAC systems

Installation Notes and Tips

Verify refrigerant type, thread dimensions, and vehicle fitment before installation. Replace sealing O-rings as part of the service procedure and inspect the surrounding A/C components for contamination or wear. Proper evacuation, leak testing, and recharge procedures are required after replacement. This valve does not list mounting hardware included.

Quality Assurance

Nissens is a recognized manufacturer of thermal and engine-efficiency components, and its aftermarket range is developed and manufactured to consistent quality standards. Part number 999379 is built for the specified BMW Z4 application and R134A system requirements.