Dayco 87788 HVAC Heater Hose - Heater To Pipe (Lower)
OE Quality 60-Day Returns
Dayco
 Small I.D. Heater Hose

Dayco 87788 HVAC Heater Hose - Heater To Pipe (Lower)

Brand Dayco 87788
Position Heater To Pipe (Lower)
Color Black
Contains Protective Sleeve Y
End 1 Inside Diameter 5/8
End 2 Inside Diameter 3/4
Hose Type Dual I.D. Hose
Material EPDM
SAE Specification SAE J20R3 Class D-1, SAE J1684 Type EC
Trunk Height 11 1/4
Product line Small I.D. Heater Hose
Fits Nissan · 11 vehicles

Dual I.D. hose. Offers two inside diameters for flexible HVAC hose routing.

EPDM construction. Resists heat and coolant exposure in demanding service.

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

Cross-references ACDelco 14270S, CARQUEST 19203 and Datsun/Nissan 92410-4S100 for the same application. See all 6.

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Dayco Small I.D. Heater Hose 87788

Dayco 87788 is a Small I.D. Heater Hose built for HVAC heater hose service where a dual inside diameter connection is required. Made from EPDM with a black finish, it includes a protective sleeve and meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications for heater hose applications.

Key Features

  • EPDM construction for heater hose durability
  • Dual I.D. hose design with 5/8 in. end 1 and 3/4 in. end 2
  • Protective sleeve included for added abrasion resistance
  • Black hose finish for a clean OE-style appearance
  • Built to SAE J20R3 Class D-1 and SAE J1684 Type EC standards
  • Compatible with 1999-2004 Nissan Frontier heater to pipe (lower) and 2000-2004 Nissan Xterra heater to pipe (lower)

Product Details

This Dayco heater hose is part of the Small I.D. Heater Hose line, which focuses on replacement hoses with specific inside diameters for tighter HVAC routing needs. Part number 87788 is a dual I.D. hose that transitions from 5/8 inch to 3/4 inch, making it a direct match for the listed lower heater-to-pipe applications on Nissan Frontier and Nissan Xterra models. This part cross-references Gates 19203 and NAPA 11203 for the same application.

Common Issues This Hose Can Address

  • Coolant leakage at a worn heater hose connection
  • Cracking or hardening from age and heat exposure
  • Improper sealing at a mismatched hose diameter
  • Restricted heater coolant flow from a deteriorated hose
  • Visible swelling, splitting, or abrasion on the existing hose

Installation Notes

Verify the hose routing and end diameters before installation. This hose is listed for the heater to pipe (lower) position on 1999-2004 Nissan Frontier and 2000-2004 Nissan Xterra, so confirm the vehicle year and heater hose path against the original part. Inspect adjoining pipes, clamps, and coolant condition during replacement to help ensure a proper seal and reliable heater circuit operation.

Quality Assurance

Dayco manufactures this hose to recognized SAE heater hose specifications, supporting consistent material and dimensional requirements for the listed applications. The EPDM construction and protective sleeve add durability for everyday HVAC coolant routing.

Related reading

This part fits 11 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2004NissanFrontier3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2004NissanXterra3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2003NissanFrontier3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2003NissanXterra3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2002NissanFrontier3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2002NissanXterra3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2001NissanFrontier3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2001NissanXterra3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2000NissanFrontier3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
2000NissanXterra3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
1999NissanFrontier3.3LV6Heater To Pipe (Lower)Small I.D. Heater Hose
Directly replaces or cross-references 6 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 14270SCARQUEST — 19203Datsun/Nissan — 92410-4S100Duralast — D87788Gates — 19203NAPA — 11203