Four Seasons 63128 A/C Refrigerant Discharge / Suction Hose Assembly

Four Seasons 63128 A/C Hose Assembly

The Four Seasons 63128 hose assembly is a discharge and suction line built for HVAC service on select Cadillac applications. It uses aluminum and rubber construction with P-nut fittings, a muffler, and an included gasket or seal to support a proper refrigerant connection.

Compatible with 2017-2019 Cadillac ATS and 2018-2019 Cadillac CTS, this A/C refrigerant discharge / suction hose assembly is specified for R134A and R1234YF systems. Four Seasons 63128 is a direct-fit style replacement for vehicles that need a serviceable hose assembly in the HVAC refrigerant circuit.

Key Features

• Part type: A/C refrigerant discharge / suction hose assembly
• Material: aluminum / rubber for HVAC routing and flexibility
• End 1 and End 2: P-nut fittings
• Refrigerant type: R134A and R1234YF
• Gasket or seal included
• Switch service port: yes
• Muffler included in the line assembly
• Bracket not included
• Service port not included

Product Details

Four Seasons builds this hose assembly using its mobile A/C experience and product testing standards to support long-term HVAC operation. The 63128 is engineered as a discharge and suction line for Cadillac ATS and Cadillac CTS models listed in the fitment data, with P-nut fittings at both ends for the specified connection points. This part cross-references Continental 63128 for the same application.

Use Four Seasons 63128 when replacing a worn, leaking, or damaged A/C hose assembly on 2017-2019 Cadillac ATS or 2018-2019 Cadillac CTS vehicles. The combination of aluminum and rubber helps balance routing durability with flexibility in the refrigerant line path.

What This Part Helps Address

• Refrigerant leaks from a cracked or deteriorated hose assembly
• Loss of A/C performance caused by restricted or damaged refrigerant flow
• Noise or vibration concerns related to a worn HVAC line
• Service issues on vehicles using P-nut fitting connections
• Replacement needs for discharge and suction line service on Cadillac ATS and CTS models

Installation Notes

Verify the vehicle’s refrigerant system type before installation, since this assembly is listed for R134A and R1234YF applications. Confirm the P-nut fitting style, line routing, and connection points on the vehicle before removal of the original hose. The part number 63128 should be matched to the exact Cadillac ATS or Cadillac CTS application shown in the fitment data.

Because fittings are not included and the assembly is listed without a bracket, inspect the existing mounting and connection hardware during service. Proper evacuation, recharge, and leak checking should be performed after installation to restore HVAC operation.

Quality Assurance

Four Seasons states that its HVAC products are engineered and tested for dependable operation, backed by more than 50 years of mobile A/C experience. Part number 63128 is built to support consistent service on the specified Cadillac applications.