Four Seasons 78561 A/C Compressor

Overview of Four Seasons New Compressor 78561

The Four Seasons New Compressor 78561 is designed to restore efficient air conditioning performance in select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab vehicles. Engineered for compatibility with R134a refrigerant, this A/C compressor ensures reliable operation in models such as the Trailblazer, Envoy, and Ascender.

• Compatible with R134a refrigerant and Pag 46 oil
• Includes clutch and heat sensor switch for precise control
• 12-volt coil with 1 wire lead for straightforward electrical connection
• 6-groove serpentine pulley with 3.875-inch diameter
• Tangent mount type with 2.000-inch clutch to mounting flange distance
• Sealing washer type suction and discharge ports with included O-rings
• Designed for Sanden/Sankyo TRSA12 compressor type applications

Four Seasons New Compressor Product Line Details

The New Compressor line from Four Seasons focuses on delivering brand-new, direct replacement A/C compressors that meet original equipment specifications. This product line emphasizes quality components such as included oil fill, heat switch, and clutch assembly to simplify installation and ensure system compatibility. The 78561 model exemplifies this approach by providing a complete compressor unit ready for installation in compatible vehicles.

Technical Description and Features

The Four Seasons 78561 A/C compressor is engineered for vehicles using R134a refrigerant and compatible with Pag 46 refrigerant oil, ensuring proper lubrication and system longevity. It features a 12-volt coil with a single wire lead, facilitating electrical integration. The clutch assembly, included with the compressor, has a maximum diameter of 3.875 inches and operates with a heat switch to regulate engagement. The pulley system includes a 6-groove serpentine belt design with a 3.875-inch diameter, supporting efficient power transfer. Mounting is via a tangent mount with a 2.000-inch distance from clutch to mounting flange, matching OEM specifications. Both suction and discharge ports utilize sealing washers with included O-rings for leak prevention.

Compatible Vehicles and Applications

• Buick Rainier
• Chevrolet Trailblazer, Trailblazer EXT
• GMC Envoy, Envoy XL, Envoy XUV
• Isuzu Ascender, Bravada
• Oldsmobile models compatible with Sanden/Sankyo TRSA12 compressors
• Saab 9-7x

Common Issues Addressed by This Compressor

• Loss of A/C cooling due to compressor failure
• Clutch engagement problems causing intermittent A/C operation
• Refrigerant leaks at compressor ports
• Noise or vibration from worn pulley or clutch assembly
• Electrical issues related to coil or heat switch malfunction

Installation Notes and Tips

Installation requires removal of the old compressor and proper handling of refrigerant according to environmental regulations. The Four Seasons 78561 compressor comes oil filled and includes the clutch and heat sensor switch, but mounting hardware is not included and must be reused or sourced separately. Ensure the serpentine belt is properly aligned on the 6-groove pulley. Verify the correct O-rings are installed on suction and discharge ports to prevent leaks. Electrical connections should match the pin terminal and single wire lead coil configuration.

Quality Assurance and Warranty

This Four Seasons New Compressor 78561 is a brand-new unit manufactured to meet or exceed OEM standards. It includes factory-installed components such as the clutch and heat sensor switch to ensure system compatibility. While mounting hardware is not included, the compressor is supplied with necessary O-rings and sealing washers. Four Seasons typically offers a limited warranty on their new compressors; please refer to the product documentation for specific warranty terms.