Four Seasons 55078 A/C Refrigerant Discharge / Suction Hose Assembly

Four Seasons 55078 A/C Hose Assembly

The Four Seasons 55078 is an OE replacement A/C refrigerant discharge and suction hose assembly built for rear roof air conditioning systems. It uses aluminum and rubber construction with R134a refrigerant service, making it a direct-fit service part for select Chevrolet C10, K10, K5 Blazer, and GMC Jimmy applications.

Key Features

• Brand: Four Seasons Hose Assembly
• Part number: 55078
• Discharge and suction line design for rear roof AC systems
• Aluminum / rubber construction for routing and vibration control
• R134a refrigerant type
• Manifold included with muffler
• Gasket or seal included
• O-rings included and specified for OE-style service
• Female O-ring discharge end and male O-ring suction end
• OE replacement design
• Service port and switch port not included
• Fittings and bracket not included

Product Details

Four Seasons Hose Assembly line products are built for HVAC repair work where the original refrigerant routing must be restored without changing the system layout. This 55078 hose assembly follows the OE-style discharge and suction configuration, with a manifold and muffler integrated into the assembly for the specified rear roof AC applications. The part number 55078 is also referenced under Gates 34705 and other listed interchange numbers for the same application.

Fits 1976-1980 Chevrolet C10, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet C10 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet C20, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet C20 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet C30, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet K10, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet K10 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet K20, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet K20 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1977-1980 Chevrolet K30, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 Chevrolet K5 Blazer, w/ Rear Roof AC; Hose Assembly. Fits 1979-1980 GMC C1500 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1979-1980 GMC C2500 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1976-1980 GMC Jimmy, w/ Rear Roof AC; Hose Assembly. Fits 1979-1980 GMC K1500 Suburban, w/ Rear Roof AC; Hose Assembly. Fits 1979-1980 GMC K2500 Suburban, w/ Rear Roof AC; Hose Assembly.

What This Part Helps Fix

• Refrigerant leaks at a worn or damaged hose assembly
• Loss of A/C performance from cracked rubber sections or fatigued fittings
• Improper refrigerant flow in rear roof AC systems
• Noise or vibration issues related to an aging hose and manifold assembly
• Service problems caused by deteriorated seals or O-rings

Installation Notes

Verify the vehicle’s rear roof AC layout, hose routing, and end styles before installation. This assembly uses a female O-ring discharge end and a male O-ring suction end, with no service port, no switch port, no fittings, and no bracket included. Replace sealing components as needed and confirm R134a system service procedures are followed during evacuation and recharge.

Quality Assurance

Four Seasons 55078 is an OE replacement HVAC hose assembly built to match the specified application and refrigerant type. It includes the required seals and O-rings for the assembly as listed in the product data.