Global Parts 3411477 A/C Expansion Valve

A/C Expansion Valve for GM HVAC Service

Global Parts 3411477 is an A/C expansion valve/orifice tube for GM HVAC systems. It regulates refrigerant flow before the evaporator so the system can use cooling capacity efficiently. This part number is a direct-fit service option for select Buick Lucerne and Cadillac DTS applications.

Key Features

• Expansion valve/orifice tube design for refrigerant flow control
• Supports evaporator-side pressure drop in the A/C system
• Recommended replacement during A/C service
• Compatible with 2006-2011 Cadillac DTS and 2006-2011 Buick Lucerne applications listed below
• Global Parts part number 3411477

Detailed Description

Global Parts 3411477 is built for HVAC service work where precise refrigerant metering is required. By slowing refrigerant before it enters the evaporator, the valve helps the system deliver consistent cooling performance. This part cross-references DENSO Auto Parts 475-2078 for the same application. It is also listed for Buick Lucerne and Cadillac DTS fitments, including 2011 Buick Lucerne with system contain OEM inline filter 3441241. For buyers searching for an A/C expansion valve for 2006-2011 Cadillac DTS or a Buick Lucerne A/C flow restrictor, this part number 3411477 matches those service needs.

What It Helps Address

• Weak or uneven cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss after system service
• Restricted flow issues in the HVAC circuit
• Replacement needs during expansion valve/orifice tube service

Installation Notes and Tips

Replace the expansion valve/orifice tube during A/C system service, as recommended by the manufacturer. Verify the vehicle application and note any OEM inline filter requirement before installation. Proper evacuation, leak checking, and recharge procedures should be followed after service.

Quality Assurance

Global Parts supplies this HVAC component as a service replacement part for the listed GM applications. Part number 3411477 is referenced against OE-style interchange numbers for application matching.

Compatible Vehicles

• Fits 2011 Buick Lucerne, N/A; system contain OEM inline filter 3441241
• Fits 2006-2011 Cadillac DTS, N/A
• Fits 2006-2010 Buick Lucerne, N/A