Dayco 71147 HVAC Heater Hose - Heater To Valve

Dayco Curved Heater Hose for OE-Style Cooling Service

Dayco 71147 is a curved radiator hose built for heater circuit service where a 5/8 in. hose connection is required. Made from EPDM and finished in black, it follows the shape needed for clean routing in applications such as Ford Thunderbird, Mercury Cougar, and Ford Mustang heater and cooling systems.

Key Features

• EPDM construction for coolant and heat resistance in HVAC and engine cooling service
• Single I.D. hose with 5/8 in. inside diameter at both ends
• Curved hose profile for routing in tight engine compartments
• Black finish for a factory-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Product Details

This Dayco curved radiator hose, part number 71147, is a direct-fit style hose for heater and coolant routing where a 5/8 in. connection is specified. The EPDM rubber construction is selected for use in hot coolant environments, while the curved shape helps maintain proper hose routing in vehicles such as 1982-1987 Ford Thunderbird, 1982-1987 Mercury Cougar, and 1983-1986 Ford Mustang. This part cross-references ACDelco (e.g., 14099S, 14222S) for the same application.

What It Helps Address

• Coolant leaks at a worn or cracked heater hose
• Restricted coolant flow caused by hose collapse or deterioration
• Improper hose routing in curved or tight engine bay layouts
• Service replacement for aging heater-to-valve hose connections
• Maintenance on vehicles with 5/8 in. hose ends, including Ford Thunderbird and Mercury Cougar applications

Installation Notes and Tips

Verify the hose path, end diameters, and routing before installation. Match the 5/8 in. inside diameter at both ends to the existing connection points and confirm the application uses a curved hose profile. Inspect adjoining clamps, fittings, and hard lines for wear before placing the new hose into service. Confirm fitment for the exact vehicle and position listed, including 1987 Isuzu Impulse heater to valve applications.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for heater and coolant hose service. The 71147 part number is listed across multiple aftermarket and OE cross-references, including Ford and Motorcraft applications, supporting selection for service work on Ford Mustang, Ford Thunderbird, and Mercury Cougar platforms.