Nissens 999959 A/C Expansion Valve - Front

Overview

This Nissens A/C expansion valve is a block-style HVAC flow restrictor built for R134 refrigerant systems. It is engineered to OE-matching standards for pressure performance, tightness, opening behavior, and internal finish, making it a direct service part for Toyota and Lexus climate control repairs.

Part number 999959 is an aluminum expansion valve with included O-rings and mounting bolts whenever applicable. It is a practical replacement for Toyota 4Runner and Lexus GX460 applications that require accurate refrigerant metering in the A/C system.

Key Features

• Block-style A/C expansion valve for R134 refrigerant systems
• Aluminum construction for HVAC service applications
• Built to OE-matching standards for pressure and flow control
• Includes O-rings and mounting bolts whenever applicable
• Part number 999959 for catalog and service reference

Fitment Details

• Fits 2018-2020 Lexus GX460, front, w/ Dual Climate Control
• Fits 2015-2020 Toyota 4Runner, N/A
• Fits 2016-2017 Lexus GX460, front, w/o Dual Zone Climate Control
• Fits 2015 Lexus GX460, front

What It Helps Fix

• Inconsistent evaporator refrigerant metering
• Weak or uneven cabin cooling output
• Expansion valve leakage at the HVAC circuit
• Improper system pressure control during A/C operation

Installation Notes

Verify refrigerant type, valve style, and vehicle climate-control configuration before installation. Replace the O-rings during service and follow proper evacuation and recharge procedures after the system is opened. Confirm the part number 999959 against the original component before assembly.

Quality Assurance

Nissens validates these thermal expansion valves through testing for pressure performance, tightness, opening characteristics, set-point accuracy, and internal finish. The result is a service part produced to precise OE-matching standards for Toyota 4Runner and Lexus GX460 HVAC repairs.