Dayco 88397 HVAC Heater Hose - Heater To Pipe

Dayco Small I.D. Heater Hose 88397

Dayco 88397 is a Small I.D. Heater Hose built for heater-to-pipe service in select Ford and Mercury applications. It uses EPDM construction with a black finish and a protective sleeve to help support routing in the HVAC system.

Key Features

• EPDM heater hose construction for HVAC coolant transfer
• 23/32 in. inside diameter at both ends
• Single I.D. hose design for heater-to-pipe routing
• Black exterior with protective sleeve
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco Small I.D. Heater Hose line for select OE-style replacement applications

Product Details

This Dayco Small I.D. Heater Hose is engineered for coolant flow between the heater core circuit and pipe connections where a consistent small inside diameter is required. The EPDM material is suited for underhood HVAC hose service, while the protective sleeve adds an extra layer for routing protection. Dayco 88397 is a direct-fit heater hose option for 1994-1997 Ford Thunderbird and 1994-1997 Mercury Cougar, both in heater-to-pipe applications. This part cross-references ACDelco 16180M and Gates 19691 for the same application.

What It Is Used For

• Replacing a worn or cracked heater hose in the HVAC coolant circuit
• Restoring coolant transfer between the heater core and pipe connection
• Addressing leaks caused by age, heat cycling, or hose deterioration
• Correcting soft, swollen, or restricted small I.D. hose routing
• Supporting service on Ford Thunderbird and Mercury Cougar heater-to-pipe layouts

Installation Notes and Tips

Verify the 23/32 in. inside diameter at both ends before installation and confirm the hose routing matches the heater-to-pipe position listed for your vehicle. Inspect adjoining pipes, clamps, and connection points for corrosion or wear before installing Dayco 88397. Proper coolant system service and secure routing help maintain consistent heater performance.

Quality Assurance

Dayco 88397 is built to SAE J20R3 Class D-1 and SAE J1684 Type EC requirements for heater hose service. The Small I.D. Heater Hose product line focuses on OE-style fitment for select HVAC hose applications.