Four Seasons 2078N A/C Compressor Kit - Front and Rear

Four Seasons PAC-Kit w/ New Compressor

Four Seasons Part Number 2078N is an A/C compressor kit for front and rear HVAC systems on select GM and Isuzu SUVs. This PAC-Kit with new compressor is built for vehicles using a TRSA12B compressor, with application-specific components listed for the covered platforms.

Key Features

• Brand: Four Seasons
• Brand line: PAC-Kit w/ New Compressor
• Part number: 2078N
• A/C compressor kit for HVAC > A/C Clutch and Compressor applications
• Configured for front and rear air conditioning systems
• Includes a new compressor application for TRSA12B-equipped vehicles

Vehicle Fitment

• Fits 2006-2009 Chevrolet Trailblazer, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2005-2009 GMC Envoy, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2005-2009 Saab 9-7x, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2004-2006 Chevrolet Trailblazer EXT, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2004-2006 GMC Envoy XL, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2003-2006 Isuzu Ascender, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2004-2005 GMC Envoy XUV, front and rear; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2003 Chevrolet Trailblazer EXT, front and rear; w/ TRSA09K Compressor; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor
• Fits 2003 GMC Envoy XL, front and rear; w/ TRSA09K Compressor; w/ TRSA12B Compressor; 78548 (New Compressor), 83222 (Accum), 38887 (Orifice), 39011 (Exp Valve), 69991 (Flush Qty.2), 59007 (Oil Qty.2); PAC-Kit w/ New Compressor

What This Kit Helps Address

• Weak or inconsistent cabin cooling
• Compressor noise or compressor failure
• A/C performance loss in front and rear HVAC zones
• System contamination concerns after compressor replacement
• Fitment issues on TRSA12B-equipped Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, and Isuzu Ascender models

Installation Notes

Verify the compressor type before ordering, since this kit is listed for TRSA12B applications and also notes 2003 Trailblazer EXT and Envoy XL coverage with TRSA09K and TRSA12B compressor configurations. Match the vehicle year, make, model, and HVAC setup exactly to the fitment table, and follow standard A/C service procedures for flushing, oil balancing, and component replacement.

Quality Assurance

Four Seasons PAC-Kit 2078N is cataloged as a complete A/C compressor kit for the listed applications, with vehicle-specific component references provided for accurate service selection. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.