Four Seasons 40021SK A/C Compressor Replacement Service Kit

Mercedes-Benz A/C Service Kit for Compressor Replacement

Restore the A/C system on select Mercedes-Benz models with the Four Seasons 40021SK A/C Compressor Replacement Service Kit. This A/C Installer Kit is built around the components commonly needed when replacing a compressor, including the filter drier, expansion valve, compressor oil, O-ring/gasket pack, and cap and valve kit.

Four Seasons A/C Installer Kits are organized to streamline compressor service on vehicles using R134a refrigerant and PAG 46 oil. The 40021SK is a direct-fit service kit for select Mercedes-Benz CLS, CLK, C-Class, and E-Class applications.

Key Features

• Part number: 40021SK
• Brand: Four Seasons A/C Installer Kits
• Compressor oil included: PAG Oil / 46
• Refrigerant type: R134a
• Expansion device type: Block Type
• Expansion valve inlet and outlet: Insert O-Ring
• Kit includes: Filter Drier, Expansion Valve, Compressor Oil, O-Ring/Gasket Pack, Cap and Valve Kit
• Receiver drier/accumulator dimensions: 1.750 in. diameter, 16.000 in. length
• Receiver drier/accumulator inlet and outlet fitting type: Pad Mount
• Limited Lifetime warranty

Product Details

The Four Seasons 40021SK is an A/C compressor replacement service kit for Mercedes-Benz vehicles that use an R134a system with a block-style expansion device. It includes the core service components needed during compressor replacement, helping address the refrigerant circuit components that are typically serviced together. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Compatible With 2006-2011 Mercedes-Benz CLS500, 2007-2011 Mercedes-Benz CLS550, 2010-2011 Mercedes-Benz CLS350, 2007-2009 Mercedes-Benz CLK500, 2007-2009 Mercedes-Benz CLK550, 2007-2009 Mercedes-Benz CLK63 AMG, 2008-2009 Mercedes-Benz CLK350, 2006-2007 Mercedes-Benz C230, 2006-2007 Mercedes-Benz C280, 2006-2007 Mercedes-Benz C350, and 2003-2009 Mercedes-Benz E320, E350, E500, E550, E55 AMG, plus additional listed Mercedes-Benz applications.

Common Uses

• Replacing compressor-related service parts during an A/C overhaul
• Addressing restricted refrigerant flow through the expansion valve
• Servicing a contaminated or moisture-exposed receiver drier
• Replacing worn O-rings and seals in the A/C circuit
• Restoring proper R134a system service components on Mercedes-Benz CLS, CLK, C-Class, and E-Class models

Installation Notes

Verify refrigerant type, oil specification, and expansion valve style before installation. Flush the system as needed, replace the receiver drier and seals during compressor service, and evacuate the system before recharging with the correct R134a charge. Confirm fitment against the vehicle’s original A/C configuration for the exact Mercedes-Benz model and year.

Quality Assurance

Four Seasons backs this A/C service kit with a Limited Lifetime warranty. The 40021SK is built for service work on select Mercedes-Benz applications and is specified for R134a systems using PAG 46 oil.