Delphi CS0121 A/C Compressor

Delphi CS0121 A/C Compressor Overview

The Delphi CS0121 is an OE-type exact-fit A/C compressor for R134A systems with PAG oil. Built from Delphi’s OE heritage and supplier experience, it is designed for direct replacement on select Chevrolet, GMC, Oldsmobile, and Isuzu applications, including Chevrolet Blazer, S10, and GMC Sonoma models with a 6-groove pulley.

Key Features

• OE Type / Exact Fit for straightforward replacement
• H6 compressor design with clutch included
• R134A refrigerant and PAG oil compatibility
• 6-groove serpentine pulley for matched belt drive
• 12V coil with 2 o’clock coil clock position
• Blade terminal design with female connector
• Bolt-tangent mounting style
• Package includes A/C compressor, O-rings/sealing washers, and instruction sheet

Detailed Description

Delphi CS0121 is an OE-style A/C compressor engineered for vehicles that use a 6-groove serpentine belt and R134A refrigerant. The H6 compressor configuration, 12-volt coil, and clutch-included design support direct service replacement on applications such as 1998-2005 Chevrolet Blazer, 1998-2004 Chevrolet S10, and 1998-2004 GMC Sonoma. It also cross-references DENSO Auto Parts 471-9167 for the same application.

Additional fitment coverage includes 1998-2001 GMC Jimmy, 1999-2001 Oldsmobile Bravada, 1996-2000 Chevrolet Express 1500/2500/3500, 1996-2000 GMC Savana 1500/2500/3500, and 1999-2000 Isuzu Hombre, all with a 6-groove pulley. Delphi’s OE background is reflected in the compressor’s exact-fit design and application-specific construction.

Common Problems This Part Can Address

• No cold air from the vents
• Compressor clutch engagement issues
• Noise from a worn or failing compressor
• Refrigerant circulation problems in the A/C system
• Loss of cabin cooling performance on R134A systems

Installation Notes and Tips

Verify pulley groove count, compressor type, connector style, and mounting layout before installation. Replace the receiver/drier or accumulator and evacuate the system according to service procedures. Use the correct PAG oil type and follow the vehicle-specific refrigerant charge specification. Confirm the system is clean and free of debris before bringing the A/C back into service.

Quality Assurance

Delphi builds aftermarket parts using OE experience and application knowledge developed through long-term supplier relationships with major automakers. The CS0121 is an OE Type / Exact Fit compressor intended to match the original system configuration for the listed vehicles.