Universal Air CO21578AC A/C Compressor

UAC MSC130CG1 A/C Compressor Assembly

The Universal Air UAC MSC130CG1 Compressor Assembly, part number CO21578AC, is an A/C compressor for rear air conditioning applications on select GM minivans. It is listed for 2005-2006 Buick Terraza, Chevrolet Uplander, Pontiac Montana, and Saturn Relay models with rear A/C.

Key Features

• Universal Air UAC MSC130CG1 Compressor Assembly for HVAC A/C compressor replacement
• Fits 2005-2006 Buick Terraza with Rear A/C; 1st Design
• Fits 2005-2006 Chevrolet Uplander with Rear A/C; 1st Design
• Fits 2005-2006 Pontiac Montana with Rear A/C; 1st Design
• Fits 2005-2006 Saturn Relay with rear A/C
• Part number CO21578AC for catalog and service matching

Detailed Description

This compressor assembly is specified for rear A/C systems on the 2005-2006 Buick Terraza, Chevrolet Uplander, Pontiac Montana, and Saturn Relay. Use CO21578AC when replacing the original compressor assembly on vehicles listed with the 1st Design or rear A/C notes shown in the fitment data. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

What It Helps Address

• No cold air from the rear HVAC system
• Compressor seizure or internal wear
• Noise from a failing A/C compressor assembly
• Loss of refrigerant circulation through the rear A/C circuit
• System performance issues on GM minivans with rear air conditioning

Installation Notes

Verify the vehicle’s rear A/C configuration and 1st Design notes before ordering. Match the existing compressor assembly to CO21578AC and confirm the application against the vehicle identification and service information. Recover refrigerant, evacuate the system, and inspect related A/C components before installation.

Quality Assurance

Universal Air supplies HVAC replacement components for automotive air conditioning service. Confirm fitment by year, make, model, and rear A/C configuration before installation.