Four Seasons 40001SK A/C Compressor Replacement Service Kit

BMW A/C Compressor Replacement Service Kit

Four Seasons 40001SK is an A/C Installer Kit built for BMW compressor replacement service on select 2004-2010 applications. It combines the core service components needed for an R134a system refresh, including PAG 46 compressor oil, an expansion valve, a desiccant bag kit, and sealing components.

Compatible With BMW 525i, 530i, 545i, 645Ci, 550i, 650Ci, 650i, M5, M6, 528i, 528i xDrive, 528xi, 525xi, and 530xi applications listed below.

Key Features

• Four Seasons A/C Installer Kits product line for compressor replacement service
• Part number 40001SK
• Compressor oil included: PAG Oil / 46
• Expansion device type: block type
• Expansion valve inlet and outlet: insert O-ring
• Gasket and seals included
• Kit includes desiccant bag kit, expansion valve, compressor oil, O-ring/gasket pack, cap and valve kit
• Designed for R134a refrigerant systems
• Limited lifetime warranty

Detailed Description

Four Seasons 40001SK is a service kit for BMW A/C compressor replacement work where the expansion valve, oil charge, and sealing components are serviced together. The kit is organized around the parts commonly addressed during compressor replacement on R134a systems, helping restore proper refrigerant flow and sealing at the service points. This makes it a practical choice for BMW 528i, 530i, 550i, 650Ci, M5, and related models listed in the fitment data.

This part cross-references Monroe Shocks & Struts (e.g., 550459, MUK40031) for the same application.

What It Is Used For

• Replacing a failed A/C compressor service assembly on BMW vehicles
• Restoring refrigerant metering through the expansion valve
• Replacing worn seals and gaskets during A/C service
• Refreshing system oil with the specified PAG 46 formulation
• Addressing moisture control with the included desiccant bag kit

Installation Notes and Tips

• Verify the vehicle uses an R134a system before installation.
• Match the compressor oil type to the system specification; this kit includes PAG Oil / 46.
• Inspect mating surfaces and replace any damaged seals during reassembly.
• Follow BMW service procedures for evacuation, leak checking, and recharge after component replacement.
• Confirm the expansion valve style and connection type match the vehicle application before installation.

Quality Assurance

Four Seasons 40001SK is backed by a limited lifetime warranty. It is listed for 2004-2010 BMW applications including 525i, 530i, 545i, 645Ci, 550i, 650Ci, 650i, M5, M6, 528i, 528i xDrive, 528xi, 525xi, and 530xi models as specified in the fitment data.