Nissens 999552 A/C Expansion Valve

Overview

Nissens A/C expansion valve 999552 is a direct-fit refrigerant flow control component for select Mazda HVAC systems using R134A. It is built to OE matching standards and validated for pressure performance, tightness, opening behavior, set-point setting, and internal finish.

Key Features

• Fits R134A air conditioning systems.
• Includes O-rings for sealing where applicable.
• Built and tested to OE matching standards.
• Validated for pressure control, tightness, and opening performance.
• Part number 999552 for easy identification.

Fitment

• Fits 2006-2010 Mazda 5, N/A. Inlet 1: 34mm, Inlet 2: 25.5 mm, Outlet 1: 15.8 mm, Outlet 2: 15.8 mm.
• Fits 2004-2009 Mazda 3, N/A. Inlet 1: 34mm, Inlet 2: 25.5 mm, Outlet 1: 15.8 mm, Outlet 2: 15.8 mm.

What It Helps Address

• Unstable refrigerant metering through the evaporator circuit.
• Incorrect A/C pressure control caused by a worn expansion valve.
• Sealing issues at the valve connection points.
• Reduced cooling performance from internal restriction or valve wear.

Installation Notes

Confirm refrigerant type before installation; this valve is specified for R134A systems. Match the inlet and outlet dimensions to the existing unit, and replace sealing components as needed during service. Part number 999552 should be verified against the original component before installation.

Quality Assurance

Nissens tests expansion valves for pressure performance, tightness, opening characteristics, set-point accuracy, and internal finish to maintain OE matching standards. This part cross-references Monroe Shocks & Struts (e.g., BP4K61J14, EXV1051) for the same application.