Four Seasons 55778 A/C Refrigerant Discharge / Suction Hose Assembly

Four Seasons 55778 A/C Hose Assembly

The Four Seasons 55778 hose assembly is an OE replacement A/C refrigerant discharge and suction line built for 1990-1993 Ford Aerostar applications. It combines aluminum and rubber construction with springlock ends, a manifold, a muffler, and an included gasket or seal for service-focused HVAC repair.

Key Features

• Part number 55778 from Four Seasons Hose Assembly line
• Discharge and suction line for R134a refrigerant systems
• Aluminum / rubber construction for HVAC routing and flexibility
• Female springlock discharge end, 0.500 in. (12.700 mm)
• Male springlock suction end, 0.750 in. (19.050 mm)
• Includes gasket or seal and O-rings
• Manifold design with muffler and switch port
• OE replacement configuration

Detailed Description

Four Seasons 55778 is an A/C refrigerant discharge and suction hose assembly engineered for Ford Aerostar models from 1990 through 1993. This hose assembly uses aluminum and rubber materials to match the routing and connection style used in the original HVAC system, with a female springlock discharge end and a male springlock suction end for direct service replacement. The assembly is specified for R134a refrigerant systems and includes a manifold, muffler, switch port, gasket or seal, and O-rings. Four Seasons 55778 also cross-references Gates 51534 and Bosch 69951 for the same application.

What It Helps Address

• Refrigerant leaks at worn hose connections
• Loss of A/C performance from damaged discharge or suction lines
• Cracked, hardened, or oil-soaked hose sections
• Improper sealing at springlock fittings or O-ring interfaces
• HVAC service issues on 1990-1993 Ford Aerostar models

Installation Notes and Tips

Fits 1990-1993 Ford Aerostar, N/A. Verify the vehicle’s refrigerant system configuration, end styles, and port locations before installation. Transfer any required components not listed as included, and replace sealing surfaces as needed to maintain proper system integrity. Confirm the line routing matches the original OE layout before charging the system.

Quality Assurance

Four Seasons catalogs this part as an OE replacement hose assembly for the specified application, with materials and connection styles selected to match original HVAC service requirements.