Dayco 87778 HVAC Heater Hose - Heater Inlet

Brand	Dayco 87778
Position	Heater Inlet
Color	Black
End 1 Inside Diameter	19/32
End 2 Inside Diameter	23/32
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	14
Product line	Small I.D. Heater Hose
Fits	Ford and Mercury · 7 vehicles

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

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

SAE J20R3 Class D-1. Built to meet recognized heater hose performance standards.

Cross-references ACDelco 26379X, CARQUEST 22398 and Duralast E87778 for the same application. See all 8.

$75.84Free shipping

In stock · usually ships same day before 1pm CST

Step 1 — Confirm fitment

Free return shipping if it doesn't fit when you check fitment here first.

Confirm position

Select your vehicle to confirm fitment

Verify this part fits before purchasing — free returns if it doesn't

Step 2 — Quantity

Free shipping to the continental U.S.

Free returns within 60 days if it doesn't fit when fitment is verified.

Not what you need? See all HVAC Heater Hose options

Dayco Small I.D. Heater Hose for Ford Escort and Mercury Tracer

Dayco 87778 is a branched HVAC heater hose built from EPDM rubber for heater inlet service. It is shaped for small inside diameter connections and matches the listed Ford Escort and Mercury Tracer applications for a direct-fit replacement.

Key Features

EPDM construction for heater hose service
Black finish for a factory-style appearance
Branched hose design for multiple connection points
End inside diameters: 19/32, 23/32, and 1/4
Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
Dayco Small I.D. Heater Hose line for compact coolant routing

Product Details

This Dayco Small I.D. Heater Hose is engineered for heater inlet routing where a branched layout and smaller hose diameters are required. The EPDM rubber construction is suited for coolant transfer in HVAC systems, while the black hose profile helps maintain an OE-style underhood appearance. Dayco 87778 is listed for 1998-2002 Ford Escort heater inlet and 1998-1999 Mercury Tracer heater inlet applications. This part cross-references Ford F8CE-18K579-AC and Gates 22398 for the same application.

What It Helps Address

Cracked or deteriorated heater hose material
Coolant seepage at branched heater inlet routing
Restricted heater coolant flow from aged hose sections
Improper fitment from universal hose substitutions
Restoring heater hose routing on Ford Escort and Mercury Tracer models

Installation Notes and Tips

Verify the heater inlet routing and all three hose connection sizes before installation. Compare the existing hose shape, branch layout, and end diameters to the Dayco 87778 profile before removal. Inspect adjoining clamps, fittings, and coolant passages for wear or corrosion, and confirm the hose seats fully on the heater inlet connections.

Quality Assurance

Dayco 87778 is built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications, supporting heater hose performance requirements for the listed Ford Escort and Mercury Tracer applications.

This part fits 7 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Position	Notes
2002	Ford	Escort	Heater Inlet	Small I.D. Heater Hose
2001	Ford	Escort	Heater Inlet	Small I.D. Heater Hose
2000	Ford	Escort	Heater Inlet	Small I.D. Heater Hose
1999	Ford	Escort	Heater Inlet	Small I.D. Heater Hose
1999	Mercury	Tracer	Heater Inlet	Small I.D. Heater Hose
1998	Ford	Escort	Heater Inlet	Small I.D. Heater Hose
1998	Mercury	Tracer	Heater Inlet	Small I.D. Heater Hose
No rows match your filter.

Directly replaces or cross-references 8 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

ACDelco — 26379XCARQUEST — 22398Duralast — E87778Ford — F8CE-18K579-ACFord — F8CZ-18472-BBFord — XS4Z-18472-AAGates — 22398NAPA — 9031