Nissens 999455 A/C Expansion Valve

Nissens A/C Expansion Valve for Toyota and Scion

The Nissens 999455 thermal expansion valve is a block-style A/C flow restrictor built for precise refrigerant control in select Toyota, Scion, and Lexus applications. It uses an aluminum body and is specified for R134A and R1234YF systems, with OE-style fitment details that matter during HVAC service.

Fits 2007-2009 Toyota RAV4, N/A; Fits 2011-2012 Toyota RAV4, N/A; Fits 2009-2012 Toyota Corolla, N/A; Fits 2011-2014 Scion xB, N/A; Fits 2011-2014 Scion tC, N/A; Fits 2014-2015 Lexus CT200h, N/A; Fits 2016 Scion iM, N/A; Fits 2017-2018 Toyota Corolla iM, N/A.

• Part number: 999455
• Block-style A/C expansion valve for HVAC refrigerant metering
• Aluminum construction for corrosion-resistant service in the A/C circuit
• Designed for R134A and R1234YF refrigerant systems
• O-rings included for sealing at the connection points
• OE-matching validation for pressure performance, tightness, opening behavior, set-point setting, and internal finish

Detailed Application and Function

The expansion valve regulates refrigerant flow into the evaporator so the A/C system can maintain proper cooling performance. This Nissens 999455 is built to match OE-style specifications for the listed Toyota Corolla, Toyota RAV4, Scion xB, Scion tC, Scion iM, Toyota Corolla iM, and Lexus CT200h applications. It is a direct-fit HVAC service part for vehicles using the noted inlet and outlet dimensions.

This part cross-references UAC EX10292C and Global Parts Distributors LLC 3411455 for the same application.

What It Helps Fix

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance issues caused by a sticking or worn valve
• Leaks at the valve connection points
• Service concerns on Toyota RAV4 and Corolla A/C systems with the listed fitment

Installation Notes and Tips

Verify inlet and outlet dimensions before installation: inlet 1 is 31.8 mm, inlet 2 is 25.6 mm, outlet 1 is 15.5 mm, and outlet 2 is 18.3 mm. Replace the valve only after confirming the refrigerant type, system cleanliness, and correct component orientation for the vehicle. Because mounting hardware is not listed as included, reuse or source the required fasteners separately if needed.

Quality Assurance

Nissens validates these thermal expansion valves for pressure performance, sealing integrity, opening characteristics, set-point accuracy, and internal finish to align with OE matching standards. The result is a service part built for controlled refrigerant flow and consistent HVAC operation in the specified Toyota, Scion, and Lexus applications.