Dayco 87699 HVAC Heater Hose

Dayco Small I.D. Heater Hose 87699

Dayco 87699 is a Small I.D. Heater Hose built for HVAC heater circuit service where a 5/8 in. inside diameter is required at both ends. Made from EPDM and finished in black, this hose is specified to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for heater hose applications.

Use this Dayco heater hose for direct replacement service on select Pontiac Firebird, Chevrolet Camaro, Chrysler minivan, and Nissan truck/SUV applications. The Dayco Small I.D. Heater Hose line focuses on OE-style heater routing with the correct diameter and construction for engine-to-heater and pipe-to-engine connections.

Key Features

• Part number 87699
• 5/8 in. inside diameter at both ends
• EPDM construction for heater hose service
• Black finish for a factory-style appearance
• Single I.D. hose design
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Direct fitment for multiple heater hose routing positions

Detailed Description

Dayco 87699 is a small inside diameter HVAC heater hose intended for vehicles that use 5/8 in. hose connections in the heater circuit. Its EPDM rubber construction is suited to coolant transfer in heater hose routing, while the single I.D. design supports straightforward replacement of the original hose path. This part number is used across a wide range of applications, including Fits 1995-2002 Pontiac Firebird, Pipe To Engine; Fits 1995-1998 Chevrolet Camaro, Pipe To Engine; and Fits 1996-2000 Chrysler Caravan, Heater To Pipe-1 with auxiliary heater equipment.

This part cross-references ACDelco 14127S and Gates 18873 for the same application. Dayco 87699 also appears in fitment for Nissan D21, Nissan Pathfinder, and Nissan Pickup heater hose routing, making it a practical search match for buyers looking for a small I.D. heater hose by vehicle, position, or part number.

What It Helps Fix

• Coolant leaks at worn heater hose connections
• Cracked or hardened original heater hose material
• Restricted heater flow from deteriorated hose walls
• Incorrect hose diameter during heater hose replacement
• Loss of cabin heat caused by damaged heater circuit plumbing

Installation Notes and Tips

Verify the hose routing, end diameter, and position before installation. This hose is listed for multiple locations, including Pipe To Engine, Heater To Pipe-1, Heater To Pipe-2, Heater To Tee-1, Pipe-4 To Pipe-5, Pipe To Thermostat, and Heater To Engine. Confirm whether the vehicle uses auxiliary heater equipment or air conditioning-specific routing where noted in the fitment data. Match the original hose path and connection size to avoid fitment issues.

Quality Assurance

Dayco manufactures this heater hose to published SAE specifications for heater hose service, including SAE J20R3 Class D-1 and SAE J1684 Type EC. The EPDM material and OE-style sizing support consistent replacement performance in the listed applications.