Four Seasons 39074 A/C Expansion Valve

Four Seasons 39074 Expansion Valve Overview

Four Seasons 39074 is a block-type A/C expansion valve for R134A systems. It is built from aluminum and uses captured O-ring connections for the liquid and suction lines, making it a direct-service HVAC flow restrictor for select Mazda Miata, Toyota MR2 Spyder, and Toyota Prius applications.

As part of the Four Seasons Expansion Valve line, this component is made to meet or exceed OEM requirements and is specified for 1.0 ton systems with an 8.0 superheat setting. The Four Seasons 39074 expansion valve is a practical replacement choice when servicing an A/C system that needs accurate refrigerant metering and stable evaporator performance.

Key Features

• Brand: Four Seasons Expansion Valve line
• Part number: 39074
• Block-type A/C expansion valve
• Aluminum construction and aluminum finish
• R134A refrigerant type
• Captured O-ring inlet and outlet connections
• Female suction and liquid fittings
• Meets or exceeds OEM specifications
• Designed without solenoid
• Specified superheat: 8.000
• System tonnage: 1.000

Detailed Description

This Four Seasons 39074 expansion valve regulates refrigerant flow into the evaporator on select compact Toyota and Mazda HVAC systems. It uses female, non-threaded O-ring connections with captured seals for the suction and liquid ports, which supports a secure service fit in R134A air conditioning layouts. The block-type design and aluminum body make it a straightforward replacement for vehicles that require precise refrigerant control at the expansion point.

Compatible With 2001-2005 Mazda Miata, N/A; 2000-2005 Toyota MR2 Spyder, N/A; and 2001-2003 Toyota Prius, N/A. This part cross-references UAC EX10117C and EX10138C for the same application. Search terms such as Mazda Miata A/C expansion valve, Toyota MR2 Spyder expansion valve replacement, and Toyota Prius R134A expansion valve all point to this part number 39074.

What It Helps Address

• Weak or inconsistent cabin cooling
• Improper refrigerant metering at the evaporator
• A/C performance issues tied to a worn expansion valve
• Temperature fluctuations during compressor operation
• Service replacement needs on R134A HVAC systems

Installation Notes and Tips

Verify the vehicle’s refrigerant type, port style, and line sizes before installation. This valve uses captured O-ring liquid and suction connections, so inspect the sealing surfaces and confirm the correct O-ring condition during service. Always evacuate and recharge the system according to the vehicle manufacturer’s A/C procedures after replacing the valve.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM specifications. The part is built for the stated application range and is intended for service use in properly diagnosed HVAC systems on 2001-2005 Mazda Miata, 2000-2005 Toyota MR2 Spyder, and 2001-2003 Toyota Prius models.