Dayco
Small I.D. Heater Hose

Dayco 87604 HVAC Heater Hose

Brand Dayco 87604
Position Heater Outlet
Color Black
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 13
Product line Small I.D. Heater Hose
Fits Chevrolet, Saturn, Ford, Lexus, Mercury, Audi, Volkswagen, Lincoln, and Toyota · 148 vehicles

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

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

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

Cross-references ACDelco 16004M, CARQUEST 18071 and Duralast D87604 for the same application. See all 20.

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Dayco Small I.D. Heater Hose 87604

Dayco 87604 is a Small I.D. Heater Hose built for HVAC heater hose service where a dual inside diameter is required. Made from EPDM and finished in black, it follows SAE J20R3 Class D-1 and SAE J1684 Type EC specifications for heater circuit use.

Key Features

  • EPDM construction for heater hose applications
  • Dual I.D. hose design with 5/8 in. end 1 inside diameter and 3/4 in. end 2 inside diameter
  • Black finish for a clean OE-style appearance
  • Meets SAE J20R3 Class D-1 and SAE J1684 Type EC requirements
  • Dayco Small I.D. Heater Hose line for select HVAC hose routing needs

Product Details

This heater hose is used in cooling-system and HVAC plumbing where a small inside diameter hose is required between heater components, pipes, valves, thermostats, and engine connections. The dual I.D. layout helps match factory routing on vehicles that use different hose sizes at each end, including applications such as Ford Taurus pipe-to-thermostat routing, Chevrolet Malibu heater-to-pipe routing, and Audi A6 pipe-to-pipe service. Dayco 87604 is also referenced for select Chevrolet Cobalt, Saturn Aura, Saturn Ion, Lexus LS430, Mercury Sable, and Ford E-Series heater hose applications.

This part cross-references Gates 18071 and NAPA 10071 for the same application.

What It Helps Address

  • Cracked or hardened heater hose material
  • Coolant seepage at heater hose connections
  • Incorrect hose sizing at mixed-diameter heater circuit points
  • Restricted heater flow caused by deteriorated hose sections
  • Service replacement for routed heater lines on select Ford, Chevrolet, Saturn, Audi, Volkswagen, Toyota, Lexus, and Mercury vehicles

Installation Notes and Tips

Verify the hose routing, end diameters, and connection points before installation. Some listed applications require the hose to be cut on both ends to match the vehicle’s heater pipe layout, including certain Chevrolet Malibu and Saturn Aura configurations. Confirm the position shown in the fitment data, such as heater outlet, heater to pipe, pipe to thermostat, heater to valve, pipe to pipe, lower, heater inlet, pipe to engine, heater to engine, or heater to pipe-2, before final fitment.

  • Fits 2008-2010 Chevrolet Cobalt, heater outlet
  • Fits 2008-2010 Chevrolet Malibu, heater to pipe; hose must be cut on both ends
  • Fits 2007-2009 Saturn Aura, heater to pipe; hose must be cut on both ends
  • Fits 2000-2007 Ford Taurus, pipe to thermostat
  • Fits 2003-2007 Saturn Ion, heater outlet
  • Fits 2001-2006 Lexus LS430, heater to valve
  • Fits 2000-2005 Mercury Sable, pipe to thermostat
  • Fits 2003-2004 Mercury Marauder, heater to outlet
  • Fits 1995-2001 Audi A6, pipe to pipe
  • Fits 2000-2001 Audi A6 Quattro, pipe to pipe
  • Fits 1995-1998 Audi A6 Quattro, pipe to pipe
  • Fits 1998-2001 Volkswagen Passat, pipe to pipe
  • Fits 2000 Chevrolet Impala, lower
  • Fits 2000 Chevrolet Impala, heater inlet
  • Fits 1998 Volkswagen Passat, pipe to pipe; GLX
  • Fits 1996-1997 Ford Crown Victoria, heater to pipe
  • Fits 1996-1997 Lincoln Town Car, heater outlet; fits models with Auto Temp. Control
  • Fits 1996-1997 Mercury Grand Marquis, heater to pipe
  • Fits 1994 Mercury Grand Marquis, heater to pipe
  • Fits 1994-1995 Ford Taurus, heater to pipe; w/o Police Pkg.
  • Fits 1994-1995 Mercury Sable, heater to pipe; w/o Police Pkg.
  • Fits 1990-1994 Lincoln Continental, heater to pipe
  • Fits 1990-1993 Ford Taurus, heater to pipe
  • Fits 1991-1993 Lincoln Town Car, heater to pipe-1
  • Fits 1992-1993 Mercury Grand Marquis, heater to pipe-1
  • Fits 1989-1993 Mercury Sable, heater to pipe
  • Fits 1990-1991 Ford E-150 Econoline, pipe to engine
  • Fits 1988 Ford E-150 Econoline, pipe to engine
  • Fits 1986 Ford E-150 Econoline, pipe to engine
  • Fits 1990-1991 Ford E-150 Econoline Club Wagon, pipe to engine
  • Fits 1988 Ford E-150 Econoline Club Wagon, pipe to engine
  • Fits 1986 Ford E-150 Econoline Club Wagon, pipe to engine
  • Fits 1990-1991 Ford E-250 Econoline, pipe to engine
  • Fits 1988 Ford E-250 Econoline, pipe to engine
  • Fits 1986 Ford E-250 Econoline, pipe to engine
  • Fits 1990-1991 Ford E-250 Econoline Club Wagon, pipe to engine
  • Fits 1988 Ford E-250 Econoline Club Wagon, pipe to engine
  • Fits 1986 Ford E-250 Econoline Club Wagon, pipe to engine
  • Fits 1990-1991 Ford E-350 Econoline, pipe to engine
  • Fits 1988 Ford E-350 Econoline, pipe to engine
  • Fits 1986 Ford E-350 Econoline, pipe to engine
  • Fits 1990-1991 Ford E-350 Econoline Club Wagon, pipe to engine
  • Fits 1988 Ford E-350 Econoline Club Wagon, pipe to engine
  • Fits 1986 Ford E-350 Econoline Club Wagon, pipe to engine
  • Fits 1989 Ford E-150 Econoline, heater to engine
  • Fits 1989 Ford E-150 Econoline Club Wagon, heater to engine
  • Fits 1989 Ford E-250 Econoline, heater to engine
  • Fits 1989 Ford E-250 Econoline Club Wagon, heater to engine
  • Fits 1989 Ford E-350 Econoline, heater to engine
  • Fits 1989 Ford E-350 Econoline Club Wagon, heater to engine
  • Fits 1988-1989 Toyota 4Runner, pipe to engine; w/Aux. Heater
  • Fits 1988-1989 Toyota Pickup, pipe to engine; w/Aux. Heater
  • Fits 1987 Ford E-150 Econoline, heater to pipe-2
  • Fits 1987 Ford E-150 Econoline Club Wagon, heater to pipe-2
  • Fits 1987 Ford E-250 Econoline, heater to pipe-2
  • Fits 1987 Ford E-250 Econoline Club Wagon, heater to pipe-2
  • Fits 1987 Ford E-350 Econoline, heater to pipe-2
  • Fits 1987 Ford E-350 Econoline Club Wagon, heater to pipe-2
  • Fits 1985 Ford E-150 Econoline, pipe to thermostat; compatible with vehicles containing air conditioning
  • Fits 1985 Ford E-150 Econoline Club Wagon, pipe to thermostat; compatible with vehicles containing air conditioning
  • Fits 1985 Ford E-250 Econoline, pipe to thermostat; compatible with vehicles containing air conditioning
  • Fits 1985 Ford E-250 Econoline Club Wagon, pipe to thermostat; compatible with vehicles containing air conditioning
  • Fits 1985 Ford E-350 Econoline, pipe to thermostat; compatible with vehicles containing air conditioning
  • Fits 1985 Ford E-350 Econoline Club Wagon, pipe to thermostat; compatible with vehicles containing air conditioning
  • Fits 1983-1984 Ford E-150 Econoline, pipe to thermostat
  • Fits 1983-1984 Ford E-150 Econoline Club Wagon, pipe to thermostat
  • Fits 1983-1984 Ford E-250 Econoline, pipe to thermostat
  • Fits 1983-1984 Ford E-250 Econoline Club Wagon, pipe to thermostat
  • Fits 1983-1984 Ford E-350 Econoline, pipe to thermostat
  • Fits 1983-1984 Ford E-350 Econoline Club Wagon, pipe to thermostat
  • Fits 1983 Ford E-100 Econoline, pipe to thermostat
  • Fits 1983 Ford E-100 Econoline Club Wagon, pipe to thermostat

Quality Assurance

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

This part fits 148 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2010ChevroletCobalt2.0LL4Heater OutletSmall I.D. Heater Hose
2010ChevroletMalibu2.4LL4ELECTRIC/GASHeater To PipeHose Must Be Cut On Both Ends; Small I.D. Heater Hose
2009ChevroletCobalt2.0LL4Heater OutletSmall I.D. Heater Hose
2009ChevroletMalibu2.4LL4ELECTRIC/GASHeater To PipeHose Must Be Cut On Both Ends; Small I.D. Heater Hose
2009SaturnAura2.4LL4ELECTRIC/GASHeater To PipeHose Must Be Cut On Both Ends; Small I.D. Heater Hose
2008ChevroletCobalt2.0LL4Heater OutletSmall I.D. Heater Hose
2008ChevroletMalibu2.4LL4ELECTRIC/GASHeater To PipeHose Must Be Cut On Both Ends; Small I.D. Heater Hose
2008SaturnAura2.4LL4ELECTRIC/GASHeater To PipeHose Must Be Cut On Both Ends; Small I.D. Heater Hose
2007FordTaurusPipe To ThermostatSmall I.D. Heater Hose
2007SaturnAura2.4LL4Heater To PipeHose Must Be Cut On Both Ends; Small I.D. Heater Hose
2007SaturnIon2.2LL4Heater OutletSmall I.D. Heater Hose
2007SaturnIon2.4LL4Heater OutletSmall I.D. Heater Hose
2006FordTaurusPipe To ThermostatSmall I.D. Heater Hose
2006LexusLS430Heater To ValveSmall I.D. Heater Hose
2006SaturnIon2.2LL4Heater OutletSmall I.D. Heater Hose
2006SaturnIon2.4LL4Heater OutletSmall I.D. Heater Hose
2005FordTaurus3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2005LexusLS430Heater To ValveSmall I.D. Heater Hose
2005MercurySable3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2005SaturnIon2.2LL4Heater OutletSmall I.D. Heater Hose
2004FordTaurus3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2004LexusLS430Heater To ValveSmall I.D. Heater Hose
2004MercuryMarauderHeater To OutletSmall I.D. Heater Hose
2004MercurySable3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2004SaturnIon2.2LL4Heater OutletSmall I.D. Heater Hose
2003FordTaurus3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2003LexusLS430Heater To ValveSmall I.D. Heater Hose
2003MercuryMarauderHeater To OutletSmall I.D. Heater Hose
2003MercurySable3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2003SaturnIonHeater OutletSmall I.D. Heater Hose
2002FordTaurus3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2002LexusLS430Heater To ValveSmall I.D. Heater Hose
2002MercurySable3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2001AudiA6Pipe To PipeSmall I.D. Heater Hose
2001AudiA6 Quattro2.8LV6Pipe To PipeSmall I.D. Heater Hose
2001FordTaurus3.0LV6GASPipe To ThermostatSmall I.D. Heater Hose
2001LexusLS430Heater To ValveSmall I.D. Heater Hose
2001MercurySable3.0LV6GASPipe To ThermostatSmall I.D. Heater Hose
2001VolkswagenPassat2.8LV6Pipe To PipeSmall I.D. Heater Hose
2000AudiA6Pipe To PipeSmall I.D. Heater Hose
2000AudiA6 Quattro2.8LV6Pipe To PipeSmall I.D. Heater Hose
2000ChevroletImpala3.8LV6LowerSmall I.D. Heater Hose
2000ChevroletImpala3.8LV6Heater InletSmall I.D. Heater Hose
2000FordTaurus3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2000MercurySable3.0LV6Pipe To ThermostatSmall I.D. Heater Hose
2000VolkswagenPassat2.8LV6Pipe To PipeSmall I.D. Heater Hose
1999AudiA6Pipe To PipeSmall I.D. Heater Hose
1999VolkswagenPassat2.8LV6Pipe To PipeSmall I.D. Heater Hose
1998AudiA6Pipe To PipeSmall I.D. Heater Hose
1998AudiA6 QuattroPipe To PipeSmall I.D. Heater Hose
1998VolkswagenPassat2.8LV6Pipe To PipeSmall I.D. Heater Hose
1998VolkswagenPassat2.8LV6Pipe To PipeGLX; Small I.D. Heater Hose
1997AudiA6Pipe To PipeSmall I.D. Heater Hose
1997AudiA6 QuattroPipe To PipeSmall I.D. Heater Hose
1997FordCrown VictoriaHeater To PipeSmall I.D. Heater Hose
1997LincolnTown CarHeater OutletFits models with Auto Temp. Control.; Small I.D. Heater Hose
1997MercuryGrand MarquisHeater To PipeSmall I.D. Heater Hose
1996AudiA6Pipe To PipeSmall I.D. Heater Hose
1996AudiA6 QuattroPipe To PipeSmall I.D. Heater Hose
1996FordCrown VictoriaHeater To PipeSmall I.D. Heater Hose
1996LincolnTown CarHeater OutletFits models with Auto Temp. Control.; Small I.D. Heater Hose
1996MercuryGrand MarquisHeater To PipeSmall I.D. Heater Hose
1995AudiA6Pipe To PipeSmall I.D. Heater Hose
1995AudiA6 QuattroPipe To PipeSmall I.D. Heater Hose
1995FordTaurus3.8LV6Heater To Pipew/o Police Pkg.; Small I.D. Heater Hose
1995MercurySable3.8LV6Heater To Pipew/o Police Pkg.; Small I.D. Heater Hose
1994FordTaurus3.8LV6Heater To Pipew/o Police Pkg.; Small I.D. Heater Hose
1994LincolnContinentalHeater To PipeSmall I.D. Heater Hose
1994MercuryGrand MarquisHeater To PipeSmall I.D. Heater Hose
1994MercurySable3.8LV6Heater To Pipew/o Police Pkg.; Small I.D. Heater Hose
1993FordTaurus3.8LV6Heater To PipeSmall I.D. Heater Hose
1993LincolnContinentalHeater To PipeSmall I.D. Heater Hose
1993LincolnTown CarHeater To Pipe-1Small I.D. Heater Hose
1993MercuryGrand MarquisHeater To Pipe-1Small I.D. Heater Hose
1993MercurySable3.8LV6Heater To PipeSmall I.D. Heater Hose
1992FordTaurus3.8LV6Heater To PipeSmall I.D. Heater Hose
1992LincolnContinentalHeater To PipeSmall I.D. Heater Hose
1992LincolnTown CarHeater To Pipe-1Small I.D. Heater Hose
1992MercuryGrand MarquisHeater To Pipe-1Small I.D. Heater Hose
1992MercurySable3.8LV6Heater To PipeSmall I.D. Heater Hose
1991FordE-150 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1991FordE-150 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1991FordE-250 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1991FordE-250 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1991FordE-350 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1991FordE-350 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1991FordTaurus3.8LV6Heater To PipeSmall I.D. Heater Hose
1991LincolnContinentalHeater To PipeSmall I.D. Heater Hose
1991LincolnTown CarHeater To Pipe-1Small I.D. Heater Hose
1991MercurySable3.8LV6Heater To PipeSmall I.D. Heater Hose
1990FordE-150 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1990FordE-150 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1990FordE-250 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1990FordE-250 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1990FordE-350 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1990FordE-350 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1990FordTaurus3.8LV6Heater To PipeSmall I.D. Heater Hose
1990LincolnContinentalHeater To PipeSmall I.D. Heater Hose
1990MercurySable3.8LV6Heater To PipeSmall I.D. Heater Hose
1989FordE-150 Econoline4.9LL6Heater To EngineSmall I.D. Heater Hose
1989FordE-150 Econoline Club Wagon4.9LL6Heater To EngineSmall I.D. Heater Hose
1989FordE-250 Econoline4.9LL6Heater To EngineSmall I.D. Heater Hose
1989FordE-250 Econoline Club Wagon4.9LL6Heater To EngineSmall I.D. Heater Hose
1989FordE-350 Econoline4.9LL6Heater To EngineSmall I.D. Heater Hose
1989FordE-350 Econoline Club Wagon4.9LL6Heater To EngineSmall I.D. Heater Hose
1989MercurySable3.8LV6Heater To PipeSmall I.D. Heater Hose
1989Toyota4Runner3.0LV6Pipe To Enginew/Aux. Heater; Small I.D. Heater Hose
1989ToyotaPickup3.0LV6Pipe To Enginew/Aux. Heater; Small I.D. Heater Hose
1988FordE-150 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1988FordE-150 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1988FordE-250 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1988FordE-250 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1988FordE-350 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1988FordE-350 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1988Toyota4Runner3.0LV6Pipe To Enginew/Aux. Heater; Small I.D. Heater Hose
1988ToyotaPickup3.0LV6Pipe To Enginew/Aux. Heater; Small I.D. Heater Hose
1987FordE-150 Econoline4.9LL6Heater To Pipe-2Small I.D. Heater Hose
1987FordE-150 Econoline Club Wagon4.9LL6Heater To Pipe-2Small I.D. Heater Hose
1987FordE-250 Econoline4.9LL6Heater To Pipe-2Small I.D. Heater Hose
1987FordE-250 Econoline Club Wagon4.9LL6Heater To Pipe-2Small I.D. Heater Hose
1987FordE-350 Econoline4.9LL6Heater To Pipe-2Small I.D. Heater Hose
1987FordE-350 Econoline Club Wagon4.9LL6Heater To Pipe-2Small I.D. Heater Hose
1986FordE-150 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1986FordE-150 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1986FordE-250 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1986FordE-250 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1986FordE-350 Econoline4.9LL6Pipe To EngineSmall I.D. Heater Hose
1986FordE-350 Econoline Club Wagon4.9LL6Pipe To EngineSmall I.D. Heater Hose
1985FordE-150 Econoline4.9LL6Pipe To ThermostatCompatible with vehicles containing air conditioning.; Small I.D. Heater Hose
1985FordE-150 Econoline Club Wagon4.9LL6Pipe To ThermostatCompatible with vehicles containing air conditioning.; Small I.D. Heater Hose
1985FordE-250 Econoline4.9LL6Pipe To ThermostatCompatible with vehicles containing air conditioning.; Small I.D. Heater Hose
1985FordE-250 Econoline Club Wagon4.9LL6Pipe To ThermostatCompatible with vehicles containing air conditioning.; Small I.D. Heater Hose
1985FordE-350 Econoline4.9LL6Pipe To ThermostatCompatible with vehicles containing air conditioning.; Small I.D. Heater Hose
1985FordE-350 Econoline Club Wagon4.9LL6Pipe To ThermostatCompatible with vehicles containing air conditioning.; Small I.D. Heater Hose
1984FordE-150 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1984FordE-150 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1984FordE-250 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1984FordE-250 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1984FordE-350 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1984FordE-350 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-100 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-100 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-150 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-150 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-250 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-250 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-350 Econoline4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
1983FordE-350 Econoline Club Wagon4.9LL6Pipe To ThermostatSmall I.D. Heater Hose
Directly replaces or cross-references 20 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 16004MCARQUEST — 18071Duralast — D87604Ford — 3W7H-18K580-BAFord — F1OY-18472-CFord — F1OY-18472-DFord — F5VH-18C266-AAFord — XF1H-18K579-AAFord — YF1Z-18472-AAFreshstart — 4332Gates — 18071General Motors — 10288179General Motors — 15776141General Motors — 22682485General Motors — 22709849General Motors — 25856148Goodyear — 63068NAPA — 10071Toyota — 87245-50360V&W — 303604