Four Seasons 78499 A/C Compressor

Reliable A/C Compressor for Buick, Chevrolet, Pontiac, and Saturn

The Four Seasons New Compressor 78499 is designed to restore efficient air conditioning performance in select GM vehicles. Engineered for compatibility with R134a refrigerant, this A/C compressor suits models like the Buick Terraza, Chevrolet Uplander, Pontiac Montana, and Saturn Relay.

Key Features of Four Seasons New Compressor 78499

• Compatible refrigerant type: R134a
• Includes oil pre-filled with PAG 46 compatible refrigerant oil
• 6-groove serpentine pulley for reliable belt engagement
• Pin-type electrical terminal with 12V coil voltage and 1 wire lead coil clock position
• Compressor type: MSC105CG2 with tangent mount design
• Includes clutch assembly with a maximum diameter of 4.000 inches
• Sealing washer type suction and discharge ports for secure connections
• Includes slimline washer O-rings (part numbers 24404 and 24402)
• Mount distance of 21.59 mm and pulley diameter of 101.6 mm

About the Four Seasons New Compressor Product Line

The Four Seasons New Compressor line offers brand-new, direct replacement compressors engineered to meet original equipment specifications. This product line focuses on delivering reliable performance and durability for HVAC systems in a range of vehicles. The 78499 model is part of this line, providing a complete compressor solution including the clutch and oil, designed for straightforward installation and long-term operation.

Detailed Product Description

This Four Seasons New Compressor 78499 is a new, fully assembled A/C compressor designed specifically for use with R134a refrigerant systems. It comes pre-filled with PAG 46 oil to ensure proper lubrication and optimal compressor function. The compressor features a 6-groove serpentine pulley and a clutch assembly included for seamless integration with the vehicle’s existing belt system. The pin-type terminal and 12V coil voltage with a single wire lead simplify electrical connections. The tangent mount style and precise mounting dimensions ensure compatibility with Buick Montana, Chevrolet Uplander, Pontiac Montana, and Saturn Relay models. Both suction and discharge ports use sealing washers to maintain system integrity and prevent leaks.

Common Applications and Issues Addressed

• Replacement for failed or leaking A/C compressors in Buick Terraza and Chevrolet Uplander
• Restores proper air conditioning function in Pontiac Montana and Saturn Relay vehicles
• Solves clutch engagement problems with included clutch assembly
• Addresses refrigerant leaks due to worn or damaged compressor seals
• Improves cooling efficiency by replacing worn or noisy compressors

Installation Notes and Tips

• Ensure system is evacuated and flushed before installation to prevent contamination
• Verify compatibility with vehicle make and model prior to purchase
• Use proper torque specifications for mounting bolts; mounting hardware is not included
• Check and replace O-rings as needed to maintain sealing integrity
• Confirm electrical connections match vehicle wiring harness for pin terminal

Quality Assurance and Warranty

The Four Seasons New Compressor 78499 is a new, OEM-quality replacement part designed to meet or exceed original equipment standards. It includes pre-filled oil and clutch assembly for convenience and reliability. While specific warranty details vary, Four Seasons typically offers a limited warranty covering defects in materials and workmanship. Refer to product documentation for exact warranty terms.