Universal Air CO4911AC A/C Compressor

UAC TRSA12 A/C Compressor Assembly

The Universal Air CO4911AC is a UAC TRSA12 compressor assembly for vehicle air conditioning repair. It is built for direct replacement use on select GM and Saab applications, including Chevrolet Trailblazer and GMC Envoy models.

Key Features

• Part number CO4911AC
• UAC TRSA12 compressor assembly
• Category: HVAC A/C clutch and compressor
• Compatible with select Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, Buick Rainier, Chevrolet SSR, Trailblazer EXT, Envoy XL, Isuzu Ascender, and Envoy XUV applications
• 2006-2009 Chevrolet Trailblazer requires use of OEM connector

Application Details

This Universal Air compressor assembly is specified for 2003-2009 GM platform vehicles and related Saab applications. The CO4911AC is used in A/C system service where the original compressor has failed, the clutch or internal components are no longer operating correctly, or system performance has dropped due to compressor wear. For fitment-based searches, this part is commonly referenced as a Chevrolet Trailblazer A/C compressor, GMC Envoy compressor assembly, or Saab 9-7x compressor replacement.

Common Repair Uses

• Restores A/C compressor operation after seizure or internal wear
• Addresses loss of cabin cooling caused by compressor failure
• Replaces a noisy or inefficient compressor assembly
• Supports repair of refrigerant circulation issues tied to compressor damage
• Serves as a direct replacement for select Trailblazer and Envoy A/C service jobs

Installation Notes

• Fits 2006-2009 Chevrolet Trailblazer, N/A; requires use of OEM connector
• Fits 2005-2009 GMC Envoy, N/A
• Fits 2005-2009 Saab 9-7x, N/A
• Fits 2004-2007 Buick Rainier, N/A
• Fits 2003-2006 Chevrolet SSR, N/A
• Fits 2003-2006 Chevrolet Trailblazer EXT, N/A
• Fits 2003-2006 GMC Envoy XL, N/A
• Fits 2003-2006 Isuzu Ascender, N/A
• Fits 2004-2005 GMC Envoy XUV, N/A

Verify refrigerant system condition, flush contaminated lines when required, and confirm connector style before installation on 2006-2009 Chevrolet Trailblazer models. CO4911AC should be matched to the vehicle’s original A/C configuration before service begins.

Quality Assurance

Universal Air markets the UAC TRSA12 compressor assembly as a dedicated replacement line for HVAC service applications. Part number CO4911AC is cataloged for the listed GM and Saab vehicles to support accurate ordering and fitment verification.