Nissens 999349 A/C Expansion Valve

Nissens A/C Expansion Valve 999349

The Nissens 999349 thermal expansion valve is a block-style A/C flow restrictor built for precise refrigerant control in select Volkswagen and Audi applications. It uses an aluminum body and is specified for R134A systems, with OE-matching attention to pressure performance, tightness, opening behavior, set-point calibration, and internal finish.

Compatible With 1993-2010 Volkswagen Beetle, Golf, Jetta, Passat, Corrado, Cabrio, and R32, plus 2000-2006 Audi TT and TT Quattro applications that use the matching block valve layout. This part number 999349 is a direct-fit service option for vehicles that require the listed inlet and outlet dimensions.

Key Features

• Block-style A/C expansion valve for HVAC refrigerant metering
• Aluminum construction for OE-style fit and durability
• Designed for R134A refrigerant systems
• O-rings included for sealing at the connection points
• Built and tested to match OE pressure, opening, and tightness standards
• Cross-reference example: UAC EX529442C

Detailed Description

Nissens develops thermal expansion valves to strict manufacturing standards, with validation focused on consistent refrigerant flow control and sealing performance. The 999349 expansion valve is engineered for vehicles that use a block-type valve and the specified port dimensions, making it a practical replacement for aging or restricted A/C metering components. It is commonly searched as an A/C expansion valve for Volkswagen Beetle, Golf, Jetta, Passat, Corrado, Cabrio, and Audi TT platforms.

For shoppers comparing replacement options, part number 999349 also cross-references Global Parts Distributors LLC 3411259 for the same application.

What It Helps Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss caused by a sticking or restricted valve
• Pressure imbalance in the HVAC refrigerant circuit
• Sealing issues at the valve connection points when the original unit is worn

Installation Notes and Tips

Verify the vehicle’s refrigerant type, valve style, and port dimensions before installation. This block expansion valve uses the listed inlet and outlet thread diameters, so matching the original configuration is important for proper fitment on Volkswagen Beetle, Golf, Jetta, Passat, Corrado, Cabrio, R32, Audi TT, and Audi TT Quattro applications. Replace any worn sealing surfaces and follow the vehicle service procedure for evacuation, leak checking, and recharge after installation.

Quality Assurance

Nissens tests expansion valves for pressure performance, tightness, opening characteristics, set-point accuracy, and internal finish to OE-matching standards. The result is a service part built with controlled manufacturing and validation for consistent A/C system operation.