Four Seasons 66740 A/C Refrigerant Suction Hose

Four Seasons A/C Suction Hose 66740

Four Seasons 66740 is an A/C refrigerant suction hose assembly for select Pontiac, Oldsmobile, and Buick applications. Built with aluminum and rubber construction, it is made for R134A systems and includes the service port and seals needed for a direct replacement on the listed vehicles.

Key Features

• Part number 66740 A/C refrigerant suction hose assembly
• Aluminum / rubber construction for HVAC routing and durability
• Female O-ring end 2 connection
• Designed for R134A refrigerant systems
• Service port included; switch service port not included
• Gasket or seal included
• O-ring A number/description: 23682 / O-Ring
• Built without bracket and without muffler

Product Details

This Four Seasons hose assembly is part of the brand’s Hose Assembly line, focused on replacement HVAC hoses and pipes for mobile air conditioning systems. Four Seasons draws on more than 50 years of mobile A/C experience and states that its products are engineered and tested for long service life and dependable operation. For buyers searching for a Pontiac Grand Prix A/C suction line, an Oldsmobile Intrigue suction hose, or a Buick Century and Buick Regal refrigerant hose replacement, 66740 is the direct-fit part number to review.

This part cross-references TYC 700198 and UAC HA112078C for the same application.

Vehicle Fitment

• Fits 1998-2003 Pontiac Grand Prix, suction line; hose assembly.
• Fits 1998-1999 Oldsmobile Intrigue, suction line; hose assembly.
• Fits 1998 Buick Century, suction line; hose assembly.
• Fits 1998 Buick Regal, suction line; hose assembly.

Common Repair Symptoms

• A/C suction hose leak at the hose or O-ring connection
• Loss of refrigerant pressure in the HVAC system
• Warm air from the vents after refrigerant loss
• Cracked, hardened, or damaged suction line routing
• Service port or seal wear at the hose assembly

Installation Notes

Verify the vehicle’s refrigerant type before installation; this hose assembly is specified for R134A systems. Inspect mating surfaces, replace seals as needed, and confirm the female O-ring connection and service port match the original routing on the vehicle. Evacuate and recharge the system according to OEM service procedures after installation.

Quality Assurance

Four Seasons backs this hose assembly with product engineering and testing based on decades of mobile A/C experience, with the goal of delivering reliable replacement performance on the listed Pontiac, Oldsmobile, and Buick applications.