Four Seasons 39674 A/C Expansion Valve

Four Seasons 39674 Expansion Valve

Four Seasons 39674 is a block-type A/C expansion valve for R134A systems. It is built from aluminum and meets or exceeds OEM requirements for the listed Mazda applications, including Mazda 3, Mazda 3 Sport, and CX-30 models.

Backed by Four Seasons’ long history in mobile air conditioning, this expansion valve is engineered and tested for dependable refrigerant control in the HVAC system. The 39674 part number is a direct replacement choice for drivers and technicians servicing Mazda A/C flow restrictor needs.

Key Features

• Block-type A/C expansion valve
• Aluminum construction
• Designed for R134A refrigerant systems
• O-ring liquid and suction connections
• Liquid inlet: No. 6, liquid outlet: No. 10
• Suction inlet: No. 12, suction outlet: No. 12
• Meets or exceeds OEM specifications
• Style: w/o solenoid
• Super heat: -4.50
• Tonnage: 1

Detailed Description

The Four Seasons 39674 expansion valve regulates refrigerant flow through the A/C evaporator circuit to support proper cooling performance and system balance. Its block-style design, aluminum body, and O-ring inlet and outlet connections make it a precise replacement for Mazda HVAC service work. This part number 39674 is listed for 2019-2021 Mazda 3, 2019-2021 Mazda 3 Sport, and 2020-2021 Mazda CX-30 applications.

This part cross-references UAC EX10710C for the same application.

What It Helps Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• A/C performance loss caused by a worn expansion valve
• Temperature fluctuation in Mazda 3, Mazda 3 Sport, and CX-30 HVAC systems
• Service replacement for a leaking or restricted A/C flow control component

Installation Notes and Tips

Verify the refrigerant type, connection sizes, and system layout before installation. This valve uses O-ring fittings and does not include mounting hardware. Replace O-rings and inspect the surrounding A/C components, lines, and seals during service to help ensure a proper repair.

For fitment, use the vehicle-specific listings: Fits 2019-2021 Mazda 3, N/A; Fits 2019-2021 Mazda 3 Sport, N/A; Fits 2020-2021 Mazda CX-30, N/A.

Quality Assurance

Four Seasons states that its products are engineered and tested for years of trouble-free operation. The 39674 expansion valve is backed by more than 50 years of mobile A/C experience and is built to meet or exceed OEM standards for the listed applications.