Four Seasons 39445 A/C Expansion Valve - Front

Reliable A/C Expansion Valve for BMW Models

The Four Seasons Expansion Valve 39445 is engineered to regulate refrigerant flow in your vehicle's air conditioning system. Designed specifically for select BMW models, this aluminum block-type valve ensures efficient cooling performance with R134a refrigerant compatibility.

• Constructed from durable aluminum material
• Compatible with R134a refrigerant systems
• Block type design with two mounting holes for secure installation
• Female suction and liquid inlet/outlet fittings with captured o-ring seals
• Meets or exceeds OEM specifications for reliable fit and function

About the Four Seasons Expansion Valve Product Line

The Four Seasons Expansion Valve line focuses on precision-engineered A/C flow restrictors that maintain optimal refrigerant metering in automotive HVAC systems. This product line emphasizes OEM-level quality and fitment, ensuring that each expansion valve, including part number 39445, delivers consistent performance and durability for vehicles like the BMW 528i, 535i, 550i, and M5 series.

Detailed Product Description and Specifications

This A/C expansion valve is crafted from aluminum, providing corrosion resistance and long service life. It features a block-type design with two mounting holes for secure attachment. Both suction and liquid inlet/outlet fittings are female with No. 12 and No. 8 thread diameters respectively, and utilize non-threaded, captured o-ring seals to prevent refrigerant leaks. The valve is designed for use with R134a refrigerant and includes green o-rings ([24661] and [24608]) to ensure a tight seal. The liquid inlet and outlet sizes measure approximately 0.540 inches (13.7 mm), matching OEM dimensions for proper fitment.

Common Applications and Issues Addressed

• Regulates refrigerant flow to maintain consistent A/C cooling
• Prevents compressor damage caused by improper refrigerant metering
• Resolves issues with fluctuating cabin temperatures
• Eliminates refrigerant leaks due to worn or damaged expansion valves
• Restores proper pressure balance within the HVAC system

Installation Notes and Tips

Ensure the vehicle’s A/C system is fully evacuated and depressurized before removing the old expansion valve. Verify compatibility with your specific BMW model, such as the 640i Gran Coupe or 750Li xDrive, using part number 39445. Use proper tools to avoid damaging the aluminum fittings and always replace O-rings with the supplied green o-rings to maintain a leak-free seal. Follow manufacturer torque specifications for mounting bolts to prevent distortion.

Quality Assurance and Warranty

The Four Seasons Expansion Valve 39445 meets or exceeds OEM standards for fit, form, and function. Manufactured with precision and tested for durability, this valve is backed by Four Seasons’ quality assurance protocols. Please refer to Four Seasons’ warranty terms for coverage details.