Four Seasons 39445 A/C Expansion Valve - Front

Four Seasons 39445 Expansion Valve Overview

Four Seasons 39445 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and OE-style fitment details. It is listed for BMW front and N/A applications across multiple 2010-2019 models, including 5 Series, 6 Series, 7 Series, M5, and M6 variants.

The Four Seasons Expansion Valve line focuses on precise refrigerant metering for automotive HVAC service. This part number 39445 follows the same application coverage as the original-style valve used in supported BMW air conditioning systems.

Key Features

• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• Female inlet and outlet fittings with O-ring sealing
• Liquid inlet size: 0.540 in. (13.7 mm)
• Suction inlet size: 0.770 in. (19.6 mm)
• Suction outlet size: 0.710 in. (18.0 mm)
• Meets or exceeds OEM requirements
• Style: w/o solenoid
• Super heat rating: -9.5
• Fits 1.5 tonnage applications

Detailed Description

Four Seasons 39445 is an A/C expansion valve designed for BMW HVAC systems that use R134A refrigerant and a block-style valve layout. It features captured and female insert O-ring connections, with No. 12 suction fittings and No. 8 liquid fittings, helping maintain proper refrigerant flow control through the evaporator circuit. This part number 39445 is a direct replacement choice for service work on BMW 640i, 650i, 535i, 550i, 740i, 750i, 760Li, ActiveHybrid 5, ActiveHybrid 7, M5, and M6 applications listed in the fitment data.

This part cross-references UAC EX10439C for the same application.

Common HVAC Issues This Part Addresses

• Incorrect refrigerant metering at the evaporator
• Weak or inconsistent cabin cooling
• Pressure imbalance in the A/C system
• Expansion valve restriction from wear or contamination
• Service replacement for BMW front A/C systems

Installation Notes and Tips

• Verify the vehicle’s refrigerant type is R134A before installation.
• Match the valve style, fitting sizes, and O-ring connection layout to the original unit.
• Inspect the A/C system for contamination or debris before replacing the valve.
• Replace and lubricate sealing O-rings as needed during service.
• Confirm the vehicle position listed in fitment, including front applications where specified.

Quality Assurance

Four Seasons 39445 is listed as meeting or exceeding OEM requirements and is backed by Four Seasons’ expansion valve product line standards for HVAC service parts.