Nissens 9991055 A/C Expansion Valve - Front

Nissens A/C Expansion Valve for Toyota and Lexus

The Nissens 9991055 A/C expansion valve is a block-style thermal expansion valve built for precise refrigerant control in modern HVAC systems. It is engineered to OE-matching standards for pressure performance, tightness, opening behavior, set-point accuracy, and internal finish.

Compatible with select Lexus GX550, NX250, NX350, RX350, RX350h, RX500h, TX350, TX500h, and TX550h+ applications, as well as Toyota Camry, Corolla Cross, Grand Highlander, Highlander, Land Cruiser, Sequoia, Sienna, Tacoma, and Tundra models.

• Aluminum construction for HVAC system durability
• Block-type A/C expansion valve design
• Works with R134A and R1234YF refrigerant systems
• O-rings included for sealing at installation
• Mounting hardware included where applicable
• OE-style pressure and flow control validation

Fitment and Application Details

This part number, 9991055, is used in front HVAC applications on several Toyota and Lexus vehicles, including Fits 2024-2025 Lexus GX550, Front; Fits 2024-2025 Lexus TX350, Front; and Fits 2020-2025 Toyota Highlander, Front. It also applies to select N/A-position systems on Lexus NX250, NX350, RX350, RX350h, RX500h, and Toyota Camry, Corolla Cross, Tacoma, and Tundra models.

This part cross-references 885150E160 and EX10762C for the same application.

What This Part Helps Address

• Inconsistent cabin cooling output
• Incorrect refrigerant metering at the evaporator
• Compressor cycling caused by expansion valve restriction
• Warm air from poor A/C system pressure regulation
• Leaks at the valve connection points when seals are worn

Installation Notes and Quality Control

Replace the expansion valve when servicing the A/C system, especially after compressor failure or when contamination is present. Clean the system thoroughly, verify the correct refrigerant type before charging, and inspect mating surfaces before installing the included O-rings. The valve should be installed according to the vehicle-specific HVAC layout for Lexus and Toyota front A/C systems.

Nissens manufactures this valve under controlled testing for pressure performance, tightness, opening characteristics, set-point calibration, and internal finish to match OE requirements. Part number 9991055 is built to support accurate refrigerant flow control in the specified Toyota and Lexus applications.