Four Seasons 39019 A/C Expansion Valve - Rear

Four Seasons 39019 Expansion Valve Overview

The Four Seasons 39019 A/C expansion valve is a brass TXV built for R134A systems and used to regulate refrigerant flow at the rear HVAC circuit. It is a direct-fit service part for select Honda Pilot and Acura MDX applications, helping restore proper evaporator performance and cabin cooling balance.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 39019
• Type: TXV (thermostatic expansion valve)
• Color/material finish: Brass
• Refrigerant type: R134A
• Rear HVAC application
• Fits 2003-2008 Honda Pilot, rear
• Fits 2001-2006 Acura MDX, rear

Product Line Details

Four Seasons Expansion Valve components are cataloged for vehicle-specific HVAC service, with this 39019 valve matched to rear A/C flow control needs in select Honda and Acura platforms. The TXV design meters refrigerant into the evaporator based on system demand, supporting stable cooling performance in R134A-equipped systems.

Detailed Description

Four Seasons 39019 is an A/C expansion valve for rear HVAC use on the Honda Pilot and Acura MDX. As a thermostatic expansion valve, it controls refrigerant flow into the evaporator to help maintain correct pressure and temperature balance in the air conditioning system. This part cross-references UAC EX529465C for the same application.

What It Helps Address

• Rear A/C air that is not cooling evenly
• Refrigerant flow restriction at the evaporator inlet
• Improper system pressure control in R134A HVAC systems
• Temperature fluctuation from a worn TXV
• Reduced rear cabin comfort in Honda Pilot and Acura MDX models

Installation Notes and Tips

Verify the vehicle uses an R134A system and rear expansion valve configuration before installation. Inspect the surrounding A/C components, seals, and lines for contamination or wear, and evacuate and recharge the system according to factory service procedures after replacement. Confirm fitment by model year and rear position: Fits 2003-2008 Honda Pilot, rear; Fits 2001-2006 Acura MDX, rear.

Quality Assurance

Four Seasons catalogs this valve as a vehicle-specific HVAC replacement part for the listed Honda and Acura applications. Part number 39019 is identified for rear A/C service in these fitments and is supported by interchange references for catalog matching.