Dayco 87703 HVAC Heater Hose - Heater To Engine

Dayco Small I.D. Heater Hose 87703 Overview

Dayco 87703 is a Small I.D. Heater Hose built for heater-to-engine routing in select Chevrolet Camaro and Pontiac Firebird applications. Made from EPDM rubber with a black finish, this 5/8 in. x 5/8 in. single I.D. hose follows SAE J20R3 Class D-1 and SAE J1684 Type EC specifications for heater hose service.

Use Dayco 87703 when you need a direct-fit HVAC heater hose for 1985-1986 Chevrolet Camaro and 1985-1986 Pontiac Firebird heater-to-engine connections. This part number is also referenced by Duralast E87703 and Gates 18878 for the same application.

Key Features

• EPDM construction for heater hose service
• Black finish for a clean OE-style appearance
• 5/8 in. inside diameter at both ends
• Single I.D. hose design for heater-to-engine routing
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco 87703 part number for accurate ordering and fitment lookup

Fitment and Application

Fits 1986 Chevrolet Camaro, Heater To Engine. Fits 1985-1986 Pontiac Firebird, Heater To Engine. Fits 1985 Chevrolet Camaro, Heater To Engine, compatible with vehicles containing air conditioning.

For shoppers searching for a 1986 Chevrolet Camaro heater hose, 1985-1986 Pontiac Firebird heater hose, or Dayco 87703 heater-to-engine hose, this part matches the listed applications and hose dimensions. The 5/8 in. inside diameter on both ends supports the heater circuit routing used in these vehicles.

What This Hose Helps Address

• Cracked or aged heater hose rubber
• Coolant seepage at the heater-to-engine line
• Restricted heater hose flow from deteriorated hose material
• Incorrect hose sizing during heater hose replacement
• Service replacement for a worn Dayco 87703 application

Installation Notes and Tips

Verify the hose routing before installation and confirm both connection points use a 5/8 in. inside diameter. Inspect adjoining heater tubes, clamps, and coolant passages for wear or corrosion before installing the new hose. Match the heater-to-engine path exactly to the vehicle application listed above.

Quality Assurance

Dayco manufactures this heater hose to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications, supporting consistent material and dimensional requirements for HVAC heater hose service.