Dayco 87978 HVAC Heater Hose - Heater (Upper)

Overview of Dayco Small I.D. Heater Hose 87978

The Dayco Small I.D. Heater Hose 87978 is designed for reliable HVAC system performance in Ford and Mazda trucks. This branched heater hose is engineered to meet specific fitment requirements for Ford Ranger and Mazda B3000 models, ensuring proper coolant flow and heater function.

• Constructed from durable EPDM material for heat and chemical resistance
• Branched hose design with three different inside diameters (5/8" and 1/4")
• Complies with SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Black color for standard OEM appearance
• Compatible with Ford Ranger and Mazda B3000 HVAC systems

Detailed Product Description

The Dayco Small I.D. Heater Hose 87978 is a branched hose made from EPDM, a synthetic rubber known for its excellent resistance to heat, ozone, and automotive fluids. This hose features three ends with inside diameters of 5/8" for End 1 and End 2, and 1/4" for End 3, allowing it to connect multiple HVAC components efficiently. The outside diameters are 15/16" for the larger ends and 17/32" for the smaller end, ensuring a secure fit with OEM connectors. The hose does not include a heat shield or protective sleeve, which is typical for this type of HVAC heater hose. With a trunk height of 26, it fits precisely within the engine bay layout of the specified vehicles.

The Small I.D. Heater Hose product line by Dayco focuses on delivering hoses with smaller inside diameters tailored for HVAC heater core connections. This line is engineered to meet stringent SAE standards, providing reliable performance in heating and cooling systems for light trucks and SUVs.

Applications and Common Issues Addressed

• Replacement of cracked or leaking heater hoses in Ford Ranger and Mazda B3000 HVAC systems
• Restoring proper coolant flow to the heater core for effective cabin heating
• Resolving overheating issues caused by faulty or deteriorated heater hoses
• Preventing coolant leaks that can lead to engine damage or HVAC failure
• Maintaining OEM fit and function in HVAC hose assemblies

Installation Notes and Tips

• Ensure the vehicle is cool before removing the old heater hose to avoid burns
• Verify hose end diameters match the OEM connectors on your Ford Ranger or Mazda B3000
• Use proper clamps to secure the hose ends and prevent leaks
• Inspect surrounding components for wear or damage during installation
• Flush the cooling system if necessary to remove debris before installing the new hose

Quality Assurance and Warranty

Dayco manufactures the Small I.D. Heater Hose 87978 to meet SAE J20R3 Class D-1 and SAE J1684 Type EC standards, ensuring durability and compatibility with specified vehicle HVAC systems. The EPDM material provides resistance to heat and automotive fluids, contributing to long service life. Warranty details are subject to Dayco's standard policies and should be confirmed at the time of purchase.