Four Seasons 38618 A/C Expansion Valve

Overview of Four Seasons Expansion Valve 38618

The Four Seasons Expansion Valve 38618 is engineered for precise control of refrigerant flow in automotive air conditioning systems. Designed specifically for BMW models including 318i, 325e, 325es, 325i, 325is, 325iX, and M3, this A/C expansion valve ensures efficient cooling performance and system reliability.

• Constructed from durable aluminum material with an aluminum finish
• Compatible with R134a refrigerant type
• Block type design with 2 mounting holes for secure installation
• Female suction inlet and outlet fittings with No. 10 thread diameter (7/8" - 18 thread type)
• Female liquid inlet and outlet fittings with No. 6 and No. 8 thread diameters respectively
• Liquid inlet and outlet use O-ring sealing for leak prevention
• Meets or exceeds OEM specifications for reliable fit and function

Four Seasons Expansion Valve Product Line Details

The Expansion Valve product line by Four Seasons focuses on delivering precise refrigerant metering components for automotive HVAC systems. This line is designed to maintain optimal A/C system performance by regulating refrigerant flow accurately, which is critical for temperature control and system efficiency. The 38618 model exemplifies this with its block type design and compatibility with common refrigerants like R134a.

Technical Description and Specifications

The Four Seasons Expansion Valve 38618 features a block type construction made from aluminum, providing corrosion resistance and durability. It includes two mounting holes for secure attachment within the HVAC system. Both suction inlet and outlet fittings are female with No. 10 thread diameter and 7/8" - 18 thread type, ensuring compatibility with OEM connections. The liquid inlet and outlet fittings are also female, with No. 6 and No. 8 thread diameters respectively, and utilize O-ring seals (green o-rings [24606] and [24608]) to prevent refrigerant leaks. This valve is designed for use with R134a refrigerant, common in BMW A/C systems.

Common Applications and Problem Solving

• Restores proper refrigerant flow in BMW 318i and 325 series A/C systems
• Resolves issues related to insufficient cooling or inconsistent cabin temperature
• Addresses refrigerant leaks caused by worn or damaged expansion valves
• Prevents compressor damage by maintaining correct pressure regulation
• Improves overall HVAC system efficiency and reliability

Installation Notes and Tips

When installing the Four Seasons Expansion Valve 38618, ensure the system is fully evacuated and free of contaminants before installation. Verify that the O-rings are properly seated to prevent leaks. Use appropriate torque specifications for the mounting holes and fittings to avoid damage. This valve is designed for direct replacement on compatible BMW models, so no modifications should be necessary.

Quality Assurance and Warranty

This expansion valve meets or exceeds OEM standards, ensuring reliable performance and fitment. Four Seasons provides quality assurance backed by industry standards, although specific warranty details should be confirmed with the supplier or manufacturer documentation.