Four Seasons 39643 A/C Expansion Valve - Front

Reliable A/C Expansion Valve for BMW Models

The Four Seasons Expansion Valve 39643 is engineered to regulate refrigerant flow in your vehicle's air conditioning system. Designed specifically for various BMW models, this aluminum block-type valve ensures precise temperature control and efficient cooling performance.

• Constructed from durable aluminum for long-lasting use
• Compatible with R134a refrigerant systems
• Block type design with two mounting holes for secure installation
• Female fittings with specific thread diameters for suction and liquid inlets/outlets
• Meets or exceeds OEM specifications for reliable performance
• Designed without a solenoid for straightforward operation
• Compatible with BMW 530i, 540i, M5, X5, and other models

About the Four Seasons Expansion Valve Product Line

The Expansion Valve line by Four Seasons focuses on delivering precise refrigerant flow control components for automotive HVAC systems. This product line is designed to meet OEM standards, ensuring compatibility and performance across a range of vehicle makes and models. The 39643 valve exemplifies this commitment by providing a block-type valve optimized for R134a refrigerant systems, suitable for many BMW vehicles.

Detailed Product Description

The Four Seasons Expansion Valve 39643 is crafted from aluminum, offering durability and resistance to corrosion. It features a block-type design with two mounting holes for secure attachment. The valve includes female suction inlet and outlet fittings with No. 12 and No. 10 thread diameters, respectively, and female liquid inlet and outlet fittings with No. 6 and No. 8 thread diameters. The suction inlet uses an O-ring style seal, while the suction outlet uses a sealing washer, ensuring a tight, leak-free connection. Similarly, the liquid inlet employs a sealing washer, and the liquid outlet uses an O-ring style seal. This valve is designed for use with R134a refrigerant and has a superheat rating of -6.000, supporting a 1.5-ton air conditioning system capacity. The part does not include a switch and is designed without a solenoid, simplifying its function within the HVAC system.

Common Applications and Issues Addressed

• Regulates refrigerant flow to maintain optimal A/C system pressure
• Prevents overheating and freezing within the evaporator
• Improves cooling efficiency in BMW 530i, 540i, M5, X5, and other compatible models
• Replaces faulty or worn expansion valves causing inconsistent cabin temperatures
• Helps resolve A/C system leaks related to worn fittings or seals

Installation Notes and Tips

Ensure the vehicle’s A/C system is properly evacuated and free of contaminants before installing the expansion valve. Verify that the female fittings and thread diameters match the vehicle’s specifications to avoid leaks. Use appropriate sealing washers and O-rings as specified for suction and liquid connections. The valve mounts securely with two mounting holes; ensure proper torque to prevent damage. This valve is designed for R134a refrigerant systems and should not be used with other refrigerants.

Quality Assurance and Warranty

The Four Seasons Expansion Valve 39643 meets or exceeds OEM standards, ensuring reliable performance and durability. Manufactured with precision aluminum and designed for specific BMW models, this valve supports consistent A/C system operation. Warranty details should be confirmed with the product supplier or manufacturer.