Four Seasons 20258SK A/C Compressor Replacement Service Kit

Four Seasons 20258SK A/C Installer Kit

The Four Seasons 20258SK A/C Installer Kit is built for front and rear HVAC service on select GM SUVs with R134a systems. It combines the core replacement components needed during compressor service, including an accumulator, orifice tube, rear expansion valve, PAG 46 compressor oil, O-ring/gasket pack, and cap and valve kit.

For 2007-2010 Cadillac Escalade ESV and 2008-2010 Chevrolet Suburban 1500, Chevrolet Suburban 2500, GMC Yukon XL 1500, and GMC Yukon XL 2500 applications, this kit supports a complete A/C refresh with the correct service parts in one package. Part number 20258SK is also referenced by 551158 and MUK20031 for the same application.

Key Features

• Four Seasons A/C Installer Kits product line for compressor replacement service
• Includes accumulator, orifice tube, rear expansion valve, compressor oil, O-ring/gasket pack, and cap and valve kit
• PAG Oil / 46 included for R134a A/C systems
• Gray porous orifice tube with 0.072 in. diameter
• Accumulator with P-nut inlet and outlet fittings
• Limited lifetime warranty
• Part number: 20258SK

Detailed Description

Four Seasons 20258SK is an A/C compressor replacement service kit for vehicles using R134a refrigerant. The kit centers on the components commonly replaced during compressor service: an accumulator to manage moisture and refrigerant flow, an orifice tube for metering, a rear expansion valve, compressor oil, and sealing components for the refrigerant circuit. The included accumulator measures 3.250 inches in diameter and 8.000 inches in length, with P-nut fittings at both ends. The gray porous orifice tube uses a 0.072-inch opening, and the kit includes PAG 46 oil for system service.

This part is a direct service solution for 2007-2010 Cadillac Escalade ESV and 2008-2010 Chevrolet Suburban 1500, Chevrolet Suburban 2500, GMC Yukon XL 1500, and GMC Yukon XL 2500. If you are servicing a front and rear A/C system on these vehicles, 20258SK provides the matched service components needed for compressor replacement work.

What It Helps Address

• Compressor replacement service on R134a-equipped GM SUVs
• Moisture contamination in the A/C system
• Restricted refrigerant flow through the metering device
• Leaking seals, gaskets, or O-rings in the refrigerant circuit
• Expansion valve service on rear HVAC components

Installation Notes and Tips

• Verify refrigerant type before service; this kit is specified for R134a systems.
• Replace the accumulator and sealing components whenever the system is opened for compressor service.
• Confirm the orifice tube style and diameter match the vehicle’s original setup before installation.
• Use the included PAG 46 oil quantity and service procedure specified for the vehicle and compressor.
• Inspect the system for contamination and flush related components as needed before reassembly.

Quality Assurance

Four Seasons backs this A/C service kit with a limited lifetime warranty. The 20258SK is built as a service-focused replacement kit for select Cadillac, Chevrolet, and GMC applications, with interchange references including 551158 and MUK20031.