Dayco 87722 HVAC Heater Hose - Heater To Engine or Reservoir To Pipe

Dayco Small I.D. Heater Hose 87722

Dayco 87722 is a Small I.D. Heater Hose built for HVAC heater hose service where a dual inside-diameter connection is required. Made from EPDM and finished in black, it is sized with a 5/8 in. inside diameter on one end and 3/4 in. on the other for specific heater circuit routing.

Compatible With Jeep Liberty reservoir to pipe applications and Ford Escort, Mercury Lynx, Ford Tempo, and Mercury Topaz heater-to-engine layouts, this hose supports direct replacement needs for select vehicles without air conditioning. The Dayco Small I.D. Heater Hose line is focused on application-specific heater hose routing, including dual I.D. configurations like this one.

Key Features

• Part number 87722 for HVAC heater hose replacement
• EPDM construction for heater hose service
• Dual I.D. hose design with 5/8 in. and 3/4 in. ends
• Black finish for a clean OE-style appearance
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Compatible With select Jeep Liberty, Ford Escort, Mercury Lynx, Ford Tempo, and Mercury Topaz applications

Product Details

This Dayco heater hose is designed for small inside diameter coolant routing where the hose must transition between two different connection sizes. The EPDM rubber construction is suited for heater hose use, while the dual I.D. layout helps match the factory plumbing found on select Jeep Liberty reservoir to pipe applications and older Ford and Mercury heater-to-engine systems. Dayco 87722 is also cross-referenced with Gates 18760 for the same application.

What It Helps Fix

• Cracked or heat-aged heater hose sections
• Coolant leaks at small I.D. heater hose connections
• Improper hose sizing between reservoir and pipe fittings
• Restricted heater circuit flow from deteriorated hose material
• Service issues on select Jeep Liberty and Ford/Mercury heater hose routes

Installation Notes and Tips

Verify end sizes before installation: 5/8 in. on one end and 3/4 in. on the other. Confirm routing against the vehicle’s heater hose path and match the listed position, either reservoir to pipe or heater to engine, before cutting or clamping. This hose is listed for specific vehicles without air conditioning on the Ford and Mercury applications shown, so confirm the exact configuration before ordering.

Quality Assurance

Dayco manufactures this hose to meet SAE J20R3 Class D-1 and SAE J1684 Type EC requirements, supporting consistent heater hose performance for the listed applications. Part number 87722 is built as a direct-fit replacement for the specified vehicle fitments.