Nissens 999358 A/C Expansion Valve

Reliable A/C Expansion Valve for BMW Models

The Nissens A/C Expansion Valve 999358 is engineered to maintain optimal air conditioning performance in select BMW vehicles. Designed specifically for R134a refrigerant systems, this aluminum block-type valve ensures precise refrigerant flow control for efficient cooling.

Key Features of Nissens A/C Expansion Valve 999358

• Constructed from durable aluminum for corrosion resistance and longevity
• Compatible with R134a refrigerant systems
• Block-type design for reliable refrigerant flow restriction
• Includes four O-rings to ensure a secure, leak-free seal
• Liquid inlet fitting thread diameter: 0.4300 inches
• Liquid outlet fitting thread diameter: 0.5500 inches
• Suction inlet fitting thread diameter: 0.6300 inches
• Suction outlet fitting thread diameter: 0.7900 inches

Detailed Product Description

The Nissens A/C Expansion Valve 999358 is a precision-engineered component designed to regulate refrigerant flow within the air conditioning system of various BMW models, including the 318i, 325i, 328i, 535i, M3, M5, and Z3 among others. Its aluminum construction offers durability and resistance to corrosion, which is critical for maintaining system integrity over time. The valve is designed for use with R134a refrigerant, the standard for many modern automotive A/C systems. The block-type valve design provides consistent and accurate flow restriction, which helps maintain proper evaporator pressure and temperature for effective cabin cooling. The inclusion of four O-rings ensures a tight seal at all connection points, reducing the risk of refrigerant leaks. Precise fitting thread diameters for liquid and suction inlets and outlets facilitate straightforward integration into the HVAC system.

Applications and Common Issues Addressed

• Restores proper refrigerant flow in BMW 318i and 328i A/C systems
• Resolves inconsistent cabin cooling in BMW 535i and 540i models
• Eliminates refrigerant leaks caused by worn or damaged expansion valves
• Improves overall air conditioning efficiency in BMW M3 and M5 vehicles
• Prevents evaporator freezing and pressure imbalances in BMW Z3 and 750iL

Installation Notes and Tips

When installing the Nissens A/C Expansion Valve 999358, ensure all O-rings are properly seated to prevent leaks. This valve does not include mounting hardware, so retain original fasteners or source compatible hardware as needed. Verify thread diameters match the vehicle’s HVAC fittings for a secure connection. It is recommended to evacuate and recharge the A/C system with R134a refrigerant after installation to ensure optimal performance.

Quality Assurance and Warranty

Nissens manufactures this A/C expansion valve to meet OEM specifications, ensuring reliable performance and durability. The product includes four O-rings to maintain system integrity and minimize leak potential. While specific warranty details are not provided, Nissens products typically adhere to industry standards for quality and reliability.