Dayco 87728 HVAC Heater Hose - Heater To Pipe or Heater To Pipe-2

Dayco Small I.D. Heater Hose for Mazda Miata

Dayco 87728 is a small I.D. heater hose built for heater circuit routing where a 5/8 in. inside diameter is required at both ends. Made from EPDM and finished in black, it provides a direct replacement option for select Mazda Miata heater-to-pipe applications.

This Dayco Small I.D. Heater Hose line focuses on OE-style heater hose service with SAE J20R3 Class D-1 and SAE J1684 Type EC compliance. For buyers searching for a 1990-1992 Mazda Miata heater hose, Dayco 87728 matches the listed heater-to-pipe locations and dimensions.

Key Features

• Brand: Dayco
• Part number: 87728
• Small I.D. heater hose design
• EPDM construction for heater hose service
• Black finish
• 5/8 in. inside diameter at End 1 and End 2
• SAE J20R3 Class D-1 and SAE J1684 Type EC specification
• Single I.D. hose configuration

Detailed Description

Dayco 87728 is an HVAC heater hose intended for coolant transfer in heater plumbing where a uniform 5/8 in. inside diameter is required. Its EPDM construction and SAE-rated specification support use in heater-to-pipe routing on the Mazda Miata, including 1990-1991 Mazda Miata, Heater To Pipe, and 1992 Mazda Miata, Heater To Pipe-2. If you are sourcing a replacement heater hose for a Mazda Miata cooling and HVAC repair, this part number provides a direct fit reference for those listed positions.

Dayco’s Small I.D. Heater Hose product line is aimed at replacement hose applications that need consistent sizing and standard heater-hose construction. Part number 87728 is also a useful cross-reference point when comparing listings for the same application.

This part cross-references Gates 18736 for the same application.

Common Problems It Can Address

• Cracked or hardened heater hose material
• Coolant seepage at heater-to-pipe connections
• Restricted heater coolant flow from deteriorated hose walls
• Incorrect hose sizing during Mazda Miata heater hose replacement
• Service replacement for aging EPDM heater hose routing

Installation Notes and Tips

Verify the 5/8 in. inside diameter at both ends before installation and compare the routing to the original heater-to-pipe hose on the vehicle. Inspect adjoining pipes, clamps, and coolant passages for wear or corrosion before reassembly. This hose does not include a heat shield or protective sleeve, so confirm surrounding clearance and routing before final installation.

Quality Assurance

Dayco heater hoses are built to meet listed SAE specifications for heater hose service. For buyers maintaining a 1990-1992 Mazda Miata cooling system, Dayco 87728 offers a specification-based replacement option backed by Dayco’s established hose product line.