Nissens 999554 A/C Expansion Valve - Front

Overview

Nissens A/C Expansion Valve 999554 is a thermal expansion valve for R134A systems. It is built to OE matching standards and fits a range of Lexus and Toyota applications, including Lexus RX350, Lexus RX450h, Lexus ES350, Toyota Highlander, and Toyota Camry.

Key Features

• R134A refrigerant type for the specified air conditioning system.
• O-rings included for sealing at the connection points.
• Developed to precise OE matching standards for pressure performance, tightness, opening, set-point setting, and inner finish.
• Fits Lexus and Toyota HVAC applications with confirmed vehicle-specific dimensions.
• Part number 999554 for accurate catalog lookup and replacement matching.

Detailed Description

Nissens 999554 is an A/C expansion valve used to regulate refrigerant flow in the HVAC system. This valve is listed for 2010-2015 Lexus RX350, 2010-2015 Lexus RX450h, 2007-2012 Lexus ES350, 2007-2011 Toyota Camry, 2010-2013 Toyota Highlander, 2008 Toyota Highlander, and 2009 Toyota Highlander. The fitment data includes application-specific inlet and outlet dimensions, which should be matched during service to confirm the correct installation.

Nissens states that its thermal expansion valves are manufactured under strict testing and validation controls. The design focus is consistent pressure regulation, sealing integrity, opening behavior, set-point accuracy, and internal surface finish. The part number 999554 is also cross-referenced to 4475003120 and 8851533020 for the same application.

Common Replacement Uses

• Restores refrigerant metering when the original valve is sticking or out of specification.
• Addresses uneven cabin cooling caused by incorrect refrigerant flow control.
• Helps correct sealing issues at the valve connections when O-rings are worn.
• Supports repair of an HVAC system that is not maintaining proper expansion valve performance.

Installation Notes

Verify refrigerant type, port dimensions, and vehicle application before installation. Replace the sealing O-rings during service and follow the vehicle manufacturer’s A/C evacuation, leak check, and recharge procedures. Mounting hardware is not included.

Quality Assurance

Nissens manufactures this expansion valve to OE matching standards and subjects it to testing for pressure performance, tightness, opening characteristics, set-point setting, and inner finish.