Four Seasons 66743 A/C Refrigerant Discharge / Suction Hose Assembly

OE Replacement A/C Hose Assembly

Four Seasons 66743 is an OE replacement A/C refrigerant discharge and suction hose assembly for select Buick applications. It is built with aluminum and rubber construction, uses R134-A refrigerant, and includes the required seals and fittings for service on the listed vehicles.

Compatible with 2005-2008 Buick Allure and 2005-2008 Buick LaCrosse, this hose assembly is a direct-fit HVAC line for the discharge and suction circuit. The Four Seasons hose assembly line focuses on replacement parts that match original equipment style connections and routing requirements.

Key Features

• Part number 66743
• Discharge and suction line assembly
• Aluminum / rubber construction
• R134-A refrigerant type
• OE replacement design
• Includes gasket or seal
• Includes fittings and O-rings
• Manifold style suction connection
• Block-style manifold connection
• Built with muffler
• Discharge end: 11.700 mm P-nut fitting
• Suction end: 17.600 mm P-nut fitting
• Without service port, switch port, or bracket

Detailed Description

Four Seasons 66743 is an HVAC hose assembly for the A/C refrigerant discharge and suction circuit. It uses aluminum and rubber materials for the line construction, includes the necessary seals and O-rings, and is configured for R134-A systems. The assembly features a P-nut fitting at both the discharge and suction ends, a block-style manifold suction connection, and an integrated muffler. This part cross-references UAC HA111753C for the same application.

For Buick Allure and Buick LaCrosse models from 2005 through 2008, this Four Seasons 66743 hose assembly supports replacement of the original A/C line routing and connection points. It is an OE replacement part with fittings included and no service port, switch port, or bracket provision.

What This Part Helps Address

• Refrigerant line leakage at the discharge or suction hose
• Cracked, worn, or deteriorated rubber hose sections
• Corroded or damaged aluminum line sections
• Improper sealing at hose connections or manifold joints
• A/C performance loss caused by a compromised refrigerant line

Installation Notes and Tips

Verify the vehicle uses R134-A refrigerant and confirm the discharge and suction end styles before installation. Replace the O-rings and seals during service, and inspect the mating surfaces for corrosion or damage before connecting the new hose assembly. This part is listed for 2005-2008 Buick Allure and 2005-2008 Buick LaCrosse, so match the vehicle year and HVAC line configuration before ordering.

Quality Assurance

Four Seasons is an established HVAC parts brand, and this hose assembly is built as an OE replacement for the listed Buick applications. Part number 66743 is manufactured to match the specified connection style, refrigerant type, and line configuration for direct replacement service.