Four Seasons 78548 A/C Compressor

Overview of Four Seasons New Compressor 78548

The Four Seasons New Compressor 78548 is designed for reliable air conditioning performance in select Buick, Chevrolet, GMC, Isuzu, and Saab vehicles. Engineered to work with R134a refrigerant, this A/C compressor ensures efficient cooling for models like the Trailblazer, Envoy, and 9-7x.

• Compatible with R134a refrigerant and Pag 46 oil
• Includes clutch and heat sensor switch
• Features a 4-groove serpentine pulley
• 12-volt coil with 1 wire lead for easy connection
• Tangent mount type with precise mounting dimensions

Four Seasons New Compressor Product Line Details

The New Compressor line from Four Seasons focuses on delivering brand-new, ready-to-install A/C compressors that meet OEM specifications. This product line includes essential components such as the clutch and heat switch, pre-filled with compatible refrigerant oil, to simplify installation and ensure system compatibility. The 78548 model exemplifies this approach by providing a complete compressor solution for specific vehicle applications.

Technical Specifications and Features

This Four Seasons A/C compressor (part number 78548) is a TRSA12B type compressor designed for use with R134a refrigerant and Pag 46 oil. It includes a clutch with a maximum diameter of 3.875 inches and a pulley with four grooves suitable for serpentine belts. The pulley diameter measures approximately 98.425 mm, and the compressor features a tangent mount with a mounting distance of 40.64 mm. The coil operates at 12 volts and uses a single wire lead for the coil clock position. Both suction and discharge ports utilize sealing washers with included O-rings for secure connections. The heat switch and clutch are included, enhancing system integration and reliability.

Compatible Vehicles and Applications

• Buick 9-7x
• Chevrolet Trailblazer, Trailblazer EXT, SSR
• GMC Envoy, Envoy XL, Envoy XUV, Rainier
• Isuzu Ascender
• Saab 9-7x

This compressor is specifically designed to replace the factory unit in these models, ensuring proper fit and function within the vehicle's HVAC system.

Common Issues Addressed by This Compressor

• Loss of A/C cooling performance due to compressor failure
• Clutch engagement problems affecting air conditioning operation
• Leaks or damage in the compressor leading to refrigerant loss
• Noise or vibration caused by worn or faulty compressor components
• Electrical issues related to the heat switch or coil

Installation Notes and Tips

Installation requires removal of the old compressor and proper handling of refrigerant lines. The Four Seasons 78548 compressor comes pre-filled with compatible oil and includes the clutch and heat sensor switch, but mounting hardware is not included. Ensure the serpentine belt matches the 4-groove pulley design. Verify the mounting distance and flange measurements for correct fitment. It is recommended to replace O-rings and seals during installation to prevent leaks.

Quality Assurance and Warranty

Four Seasons New Compressor 78548 is a new, not remanufactured, component built to meet or exceed OEM standards. The product includes oil and essential components for immediate installation. While specific warranty details are not provided here, Four Seasons typically offers limited warranties on their new compressors to cover defects in materials and workmanship.