Denso 475-2078 A/C Expansion Valve

Denso A/C Expansion Valve for Lucerne and DTS

Denso New Expansion Valve 475-2078 is a block valve A/C expansion valve built to regulate refrigerant flow through the evaporator. It separates the high- and low-side circuits so the air conditioning system can maintain proper cooling performance in the 2006-2011 Buick Lucerne and 2006-2011 Cadillac DTS.

For buyers searching for a 2006-2011 Buick Lucerne A/C expansion valve or a 2006-2011 Cadillac DTS HVAC flow restrictor, this Denso part number 475-2078 matches the listed OE-style application. Denso also cross-references Buick/Cadillac OE number 15266666 for the same application.

Key Features

• Block valve design for A/C refrigerant metering
• Separates suction and discharge sides of the air conditioning system
• Helps maintain evaporator heat exchange efficiency
• Built for 2006-2011 Buick Lucerne and 2006-2011 Cadillac DTS applications
• Denso New Expansion Valve line for OE-style HVAC service
• Part number 475-2078 for direct catalog identification

How This Expansion Valve Works

The expansion valve controls how much liquid refrigerant enters the evaporator. Correct calibration is important because an incorrect valve can reduce cooling output, disrupt evaporator performance, or allow the evaporator to freeze. Denso applies its A/C component engineering experience to supply the correct expansion device for the listed vehicle applications, including Buick Lucerne and Cadillac DTS models.

What It Helps Solve

• Weak cabin cooling from improper refrigerant metering
• Evaporator icing or freeze-up
• Uneven A/C performance across the HVAC system
• Loss of heat exchange efficiency in the evaporator
• Service replacement for a worn or incorrect expansion valve

Installation Notes

Verify the vehicle year, make, and model before ordering. This part is listed for 2006-2011 Buick Lucerne and 2006-2011 Cadillac DTS, with N/A position fitment. During A/C service, confirm the system is clean and properly evacuated, and inspect related components before reassembly. Use the part number 475-2078 to match the correct application during catalog lookup.

Quality Assurance

Denso manufactures A/C components with decades of OE system engineering experience. The New Expansion Valve line is built to support correct refrigerant control in the specified applications and to meet the demands of automotive HVAC service.