Four Seasons 10721SK A/C Compressor Replacement Service Kit

Four Seasons A/C Installer Kit for Ambulance Package Applications

Restore serviceability to the air conditioning system with the Four Seasons 10721SK A/C Compressor Replacement Service Kit. This A/C Installer Kit includes the core components needed for a compressor replacement on select Chevrolet Silverado 2500 HD, Silverado 3500, GMC Sierra 2500 HD, and Sierra 3500 ambulance package applications.

Built for R134a systems, this kit includes PAG Oil / 46, an accumulator, an orifice tube kit, an O-ring/gasket pack, and a cap and valve kit. The Four Seasons A/C Installer Kits line is organized for service work that requires the matching replacement parts and sealing components in one application-specific package.

Key Features

• Part number: 10721SK
• Four Seasons A/C Installer Kits product line
• Includes compressor oil, accumulator, orifice tube kit, O-ring/gasket pack, and cap and valve kit
• PAG Oil / 46 included
• Designed for R134a refrigerant systems
• Receiver drier/accumulator dimensions: 3.500 in. diameter, 9.500 in. length
• P-nut fitting on accumulator inlet and outlet
• Gaskets and seals included
• Limited Lifetime warranty

Detailed Description

The Four Seasons 10721SK is an A/C compressor replacement service kit for select 2003-2007 Chevrolet Silverado and GMC Sierra ambulance package vehicles. It is built around the service parts commonly replaced during compressor work, including the accumulator, orifice tube kit, compressor oil, sealing components, and cap and valve kit. This makes it a practical choice when servicing R134a air conditioning systems that require matched replacement components.

Compatible With 2003-2006 Chevrolet Silverado 2500 HD, N/A; 2003-2006 Chevrolet Silverado 3500, N/A; 2003-2006 GMC Sierra 2500 HD, N/A; 2003-2006 GMC Sierra 3500, N/A; 2007 Chevrolet Silverado 2500 HD, N/A; 2007 Chevrolet Silverado 2500 HD Classic, N/A; 2007 Chevrolet Silverado 3500 Classic, N/A; 2007 Chevrolet Silverado 3500 HD, N/A; 2007 GMC Sierra 2500 HD, N/A; 2007 GMC Sierra 2500 HD Classic, N/A; 2007 GMC Sierra 3500 Classic, N/A; and 2007 GMC Sierra 3500 HD, N/A, all with ambulance package notes as listed.

This part cross-references Monroe Shocks & Struts (e.g., 551168, MUK10012) for the same application. The 10721SK part number is also referenced for interchange purposes in related catalog listings.

What It Helps Address

• Compressor replacement service on R134a systems
• Loss of system sealing at O-rings and gaskets
• Restricted refrigerant flow at the orifice tube
• Accumulator replacement during A/C repair
• Service work requiring fresh PAG Oil / 46

Installation Notes and Tips

Verify the vehicle’s ambulance package configuration before ordering, since fitment is limited to the applications listed. Confirm the refrigerant type is R134a and match the accumulator fitting style and dimensions to the original system. Replace sealing components during service and follow the vehicle manufacturer’s evacuation, charging, and oiling procedures for compressor replacement work.

Quality Assurance

Four Seasons backs this kit with a Limited Lifetime warranty. The 10721SK is cataloged as an A/C service kit for the listed Chevrolet Silverado and GMC Sierra applications, with components selected for compressor replacement service.