Dayco 87777 HVAC Heater Hose - Heater Outlet
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Dayco
 Small I.D. Heater Hose

Dayco 87777 HVAC Heater Hose - Heater Outlet

Brand Dayco 87777
Position Heater Outlet
Color Black
Contains Protective Sleeve Y
End 1 Inside Diameter 19/32
End 2 Inside Diameter 7/8
End 3 Inside Diameter 1/4
Hose Type Branched Hose
Material EPDM
SAE Specification SAE J20R3 Class D-1, SAE J1684 Type EC
Trunk Height 19
Product line Small I.D. Heater Hose
Fits Ford and Mercury · 6 vehicles

Branched hose. Routes coolant through a compact heater hose layout.

EPDM construction. Resists heat and coolant exposure for dependable performance.

Protective sleeve included. Adds extra abrasion resistance where the hose runs.

Cross-references ACDelco 24459L, CARQUEST 22399 and Duralast E87777 for the same application. See all 9.

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Dayco 87777 Small I.D. Heater Hose

Dayco 87777 is a branched HVAC heater hose built for small-diameter coolant routing in the heater outlet circuit. Made from EPDM with a black finish and a protective sleeve, it is specified for direct-fit service on select Ford Escort and Mercury Tracer applications.

Key Features

  • EPDM construction for heater hose service
  • Branched hose design for multiple connection points
  • Black finish for OE-style appearance
  • Protective sleeve included for added abrasion resistance
  • Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
  • End inside diameters: 19/32 in., 7/8 in., and 1/4 in.
  • Trunk height: 19 in.

Product Details

This Dayco Small I.D. Heater Hose line is focused on replacement routing for compact heater circuits where molded branch geometry matters. Part number 87777 uses EPDM rubber for coolant and heat exposure, and its branched layout supports the heater outlet configuration found on 1998-2002 Ford Escort and 1999 Mercury Tracer models. If you are searching for a Dayco 87777 heater hose for a Ford Escort heater outlet repair, this part matches the listed application and dimensions.

This part cross-references ACDelco 24459L and Gates 22399 for the same application.

Common Problems It Can Address

  • Cracked or split heater hose at the outlet connection
  • Coolant seepage from aged EPDM hose material
  • Restricted heater flow caused by deteriorated internal hose walls
  • Incorrect routing from a damaged branched hose assembly
  • Heat-related hose wear in the engine bay

Installation Notes and Tips

Verify the heater outlet routing and all connection diameters before installation. Match the branched layout and protective sleeve orientation to the original hose path, and inspect adjoining clamps, fittings, and coolant passages for wear or corrosion before reassembly. After installation, refill and bleed the cooling system according to the vehicle service procedure.

Quality Assurance

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

Vehicle Fitment

  • Fits 1998-2002 Ford Escort, Heater Outlet
  • Fits 1999 Mercury Tracer, Heater Outlet

Related reading

This part fits 6 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2002FordEscortHeater OutletSmall I.D. Heater Hose
2001FordEscortHeater OutletSmall I.D. Heater Hose
2000FordEscortHeater OutletSmall I.D. Heater Hose
1999FordEscortHeater OutletSmall I.D. Heater Hose
1999MercuryTracerHeater OutletSmall I.D. Heater Hose
1998FordEscortHeater OutletSmall I.D. Heater Hose
Directly replaces or cross-references 9 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 24459LCARQUEST — 22399Duralast — E87777Ford — F8CE-18C206-ABFord — F8CZ-18472-ACFord — XS4Z-18472-ABFord — YS41-18C266-DAGates — 22399NAPA — 9032