Four Seasons 65866 A/C Refrigerant Discharge / Suction Hose Assembly

Four Seasons 65866 A/C Hose Assembly

The Four Seasons 65866 is an A/C refrigerant discharge and suction hose assembly built for HVAC service on select Buick Envision models. It uses aluminum and rubber construction, includes the gasket or seal, and is configured for R134A refrigerant systems.

Compatible with 2016-2018 Buick Envision applications, this hose assembly is designed for direct replacement of the refrigerant line in the vehicle’s air conditioning system. Four Seasons backs this hose line with more than 50 years of mobile A/C experience, and the 65866 part number is also referenced in aftermarket interchange listings for the same application.

Key Features

• Part type: A/C refrigerant discharge / suction hose assembly
• Material: aluminum / rubber for HVAC routing and flexibility
• End 1 type: P-nut fitting
• End 2 type: flange
• Refrigerant type: R134A
• Gasket or seal included
• Type: discharge & suction line
• Built without bracket, without service port, and without switch service port
• Includes muffler

Detailed Description

Four Seasons Hose Assembly 65866 is engineered for the air conditioning refrigerant circuit on 2016-2018 Buick Envision models. The aluminum/rubber construction supports the routing needs of the HVAC system, while the P-nut fitting and flange end connections match the specified vehicle application. This hose assembly is intended for R134A systems and includes the gasket or seal needed at the connection point.

Four Seasons focuses on mobile A/C components with long-term service in mind, and the 65866 hose assembly reflects that approach with application-specific fitment and OE-style connection points. If you are replacing a leaking or damaged A/C refrigerant discharge/suction line on a Buick Envision, this part number provides a direct-match service option. Part number 65866 is also cross-referenced as a replacement for UAC HA113660C for the same application.

Common Problems This Part Can Address

• Refrigerant loss from a cracked or leaking A/C hose
• Damaged hose routing from age, vibration, or heat exposure
• Failed connection points at the P-nut fitting or flange end
• Reduced A/C performance caused by a compromised discharge or suction line
• Service replacement for a worn Buick Envision HVAC hose assembly

Installation Notes and Tips

Verify the vehicle’s refrigerant system uses R134A before installation. Inspect mating surfaces, replace worn seals as needed, and confirm the hose routing matches the original layout before tightening the connections. Because fittings are not included, reuse or source the correct vehicle-specific fittings as required by the repair.

For best results, evacuate and recharge the system according to OEM service procedures after the hose assembly is installed. Confirm there are no leaks at the flange and P-nut connections before returning the vehicle to service.

Quality Assurance

Four Seasons states that its mobile A/C products are engineered and tested for years of trouble-free operation. Backed by more than 50 years of mobile air conditioning experience, the 65866 hose assembly is built to support reliable HVAC repair on select Buick Envision vehicles.