Dayco 88369 HVAC Heater Hose

Dayco Small I.D. Heater Hose 88369

Dayco 88369 is a Small I.D. Heater Hose built for heater circuit routing in select Ford, Mercury, and Cadillac applications. It uses EPDM construction with a protective sleeve and a 3/4 in. inside diameter at both ends for direct replacement service.

Key Features

• EPDM heater hose construction for coolant transfer in HVAC systems
• 3/4 in. inside diameter at both ends
• Single I.D. hose design for heater-to-pipe, heater-to-engine, and heater-to-tee routing
• Protective sleeve included for added abrasion resistance
• Black finish for a factory-style appearance
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications

Product Details

This Dayco Small I.D. Heater Hose line is built for vehicles that use a smaller heater hose routing path in the HVAC system. Part number 88369 is specified for applications such as 1987-1992 Cadillac Allante heater to tee-2, 1990 Ford Escort heater to pipe, and multiple Ford Escort, Mercury Lynx, Mercury Topaz, and Ford Tempo heater hose locations from 1983-1990. It is also listed for select vehicles without air conditioning, including early and pipe-to-engine routing notes where shown in the fitment data.

Dayco 88369 is a practical replacement for aging heater hose sections that need correct diameter, routing, and material compatibility. This part cross-references Ford E3FZ-18472-A and Gates 19623 for the same application.

What It Helps Address

• Cracked or hardened heater hose sections
• Coolant seepage at heater hose connections
• Restricted heater coolant flow from deteriorated hose material
• Incorrect hose diameter during heater hose replacement
• Wear at routing points where abrasion protection is needed

Installation Notes

Verify the vehicle’s heater hose routing, end diameter, and position before installation. This hose is listed for heater to pipe, heater to engine, and heater to tee locations, so match the original routing exactly. Confirm whether the application is for vehicles with or without air conditioning, since several fitments specify no A/C or early-production configurations. Inspect clamps, pipes, and adjoining coolant components for wear before installing the new hose.

Quality Assurance

Dayco lists this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC standards, supporting specification-based replacement selection for heater hose service.