Nissens 999391 A/C Expansion Valve - Front

Reliable A/C Expansion Valve for Mercedes-Benz Metris

The Nissens 999391 A/C expansion valve is engineered to maintain optimal air conditioning performance in your Mercedes-Benz Metris. Designed specifically for R134a refrigerant systems, this aluminum block valve ensures precise refrigerant flow control for efficient cooling.

Key Features of Nissens 999391 A/C Expansion Valve

• 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: 0.3500 inches
• Liquid outlet fitting thread diameter: 0.4700 inches
• Suction inlet and outlet fitting thread diameter: 0.7100 inches
• Mounting hardware included for straightforward installation

Detailed Description of the Nissens 999391 Expansion Valve

This A/C expansion valve from Nissens is designed to regulate the flow of refrigerant within the air conditioning system of the Mercedes-Benz Metris. Its aluminum construction provides strength and resistance to corrosion, which is critical for maintaining system integrity over time. The block type valve is optimized for R134a refrigerant, the standard in many modern vehicles, ensuring compatibility and efficient operation. The included O-rings and precise fitting thread diameters help prevent leaks and maintain system pressure, contributing to consistent cooling performance.

Common Applications and Issues Addressed

• Restores proper refrigerant flow in the Mercedes-Benz Metris A/C system
• Resolves inconsistent cabin cooling or fluctuating temperatures
• Prevents refrigerant leaks with included O-rings and secure fittings
• Addresses A/C system pressure imbalances caused by faulty expansion valves
• Improves overall air conditioning efficiency and reliability

Installation Notes and Tips

When installing the Nissens 999391 expansion valve, ensure the system is fully evacuated and free of contaminants before fitting the new valve. Verify that all O-rings are properly seated to prevent leaks. Use the included mounting hardware to secure the valve firmly in place. It is recommended to check refrigerant levels and system pressure after installation to confirm proper operation.

Quality Assurance and Warranty

Nissens manufactures this expansion valve to meet OEM standards for fit and function, specifically for the Mercedes-Benz Metris. The part number 999391 is backed by Nissens' quality control processes to ensure durability and performance. Please refer to Nissens or your parts provider for specific warranty details related to this product.