Nissens 999357 A/C Expansion Valve

Nissens A/C Expansion Valve 999357

Nissens 999357 is a block-style A/C expansion valve built from aluminum for R134A systems. It regulates refrigerant flow into the evaporator to help maintain stable cooling performance in the HVAC system.

Compatible With 2000-2005 Toyota Echo and 2004-2006 Scion xA, this Nissens A/C expansion valve is a direct-fit service part for select factory air conditioning layouts. The included O-rings support a cleaner seal at the connection points.

Key Features

• Block-style A/C expansion valve for HVAC refrigerant control
• Aluminum construction for corrosion-resistant service
• Designed for R134A refrigerant systems
• O-rings included for the listed application
• Direct replacement part number 999357
• Fits 2000-2005 Toyota Echo and 2004-2006 Scion xA, N/A
• Fits 2004-2006 Scion xB, N/A

Detailed Description

This Nissens expansion valve meters liquid refrigerant into the evaporator based on system demand, helping the A/C system maintain proper pressure balance and cooling output. The aluminum block design and specified inlet and outlet thread dimensions support accurate fitment in the listed Toyota and Scion applications. Part number 999357 is also a useful reference when matching the correct HVAC flow restrictor for service work on the Toyota Echo, Scion xA, and Scion xB.

This part cross-references UAC EX10065C 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 worn expansion valve
• Refrigerant leakage at valve connection points when seals are degraded
• Service replacement needs on Toyota Echo and Scion xA/xB HVAC systems

Installation Notes and Tips

Verify refrigerant type, port style, and thread dimensions before installation. Replace the valve only after the system has been properly evacuated and serviced according to A/C procedures. Inspect the mating surfaces and use the included O-rings where specified. Confirm the vehicle application against the part number 999357 before assembly.

Quality Assurance

Nissens develops and manufactures thermal management components to consistent quality standards across its aftermarket range. The brand positions its products around controlled production and ongoing product development for modern vehicle systems.