Nissens 999444 A/C Expansion Valve - Front

Nissens A/C Expansion Valve for Toyota and Lexus

The Nissens 999444 thermal expansion valve is a block-style A/C flow restrictor built for precise refrigerant control in select Toyota, Lexus, and Scion applications. It is designed for R134A and R1234YF systems and uses an aluminum construction with OE-matching pressure performance, tightness, opening behavior, set-point calibration, and internal finish.

Fits 2006-2020 Toyota, Lexus, and Scion applications listed below, including Toyota Mirai, Lexus CT200h, Toyota Highlander front, and other confirmed models. The Nissens 999444 is a direct-fit service part for restoring proper evaporator feed control in vehicles such as the Toyota Camry, Toyota RAV4, and Lexus HS250h.

• Block-style A/C expansion valve for refrigerant flow regulation
• Aluminum body for HVAC service applications
• Works with R134A and R1234YF refrigerant systems
• Includes O-rings for sealing at the connection points
• OE-matching validation for pressure performance, tightness, opening, set-point setting, and internal finish
• Cross-reference: Toyota/Lexus OE numbers 8851502120 and 8851526070 for the same application

Detailed Product Information

This thermal expansion valve meters refrigerant into the evaporator so the HVAC system can maintain stable cooling performance. The Nissens 999444 is engineered to match original equipment specifications and is a practical replacement for vehicles needing accurate refrigerant control, including Toyota Mirai, Lexus CT200h, and Toyota Highlander front HVAC service. If you are replacing a worn or restricted A/C expansion valve, this part supports proper system balance in Toyota, Lexus, and Scion platforms that use the confirmed block-valve layout.

Common Problems This Part Can Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss caused by a sticking or restricted valve
• Temperature fluctuations from poor expansion valve control
• HVAC service needs on Toyota, Lexus, and Scion vehicles with confirmed fitment

Installation Notes and Tips

Verify refrigerant type, port dimensions, and vehicle fitment before installation. Replace the O-rings during service and inspect the mating surfaces for contamination or damage. Because this valve is used in specific Toyota, Lexus, and Scion HVAC layouts, confirm the inlet and outlet measurements against the original part before reassembly. Proper evacuation, leak checking, and recharge procedures are required after installation.

Quality Assurance

Nissens manufactures this expansion valve to strict OE-matching standards and validates pressure performance, sealing, opening characteristics, set-point accuracy, and internal finish. The part number 999444 is built for consistent HVAC service quality in confirmed Toyota, Lexus, and Scion applications.