Dayco
Curved Radiator Hose

Dayco 71178 Radiator Coolant Hose

Brand Dayco 71178
Position Upper
Color Black
End 1 Inside Diameter 1 1/4
End 2 Inside Diameter 1 1/4
Hose Type Single I.D. Hose
Material EPDM
SAE Specification SAE J20R4 Class D-1, SAE J1684 Type EC
Trunk Height 16
Product line Curved Radiator Hose
Fits BMW, INFINITI, Mazda, Toyota, Buick, Eagle, Mitsubishi, Oldsmobile, Dodge, Plymouth, Ford, Isuzu, Nissan, Pontiac, Saab, Chevrolet, Triumph, Lancia, Mercury, Fiat, and Alfa Romeo · 152 vehicles

Curved radiator hose. Shaped for a cleaner, more direct coolant routing.

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

Single I.D. hose. Provides a straightforward replacement for coolant transfer.

Cross-references ACDelco 20002S, ACDelco 20266S and ACDelco 22213M for the same application. See all 117.

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Dayco 71178 Curved Radiator Hose

Dayco 71178 is a curved radiator coolant hose built for upper and lower cooling-system routing on a wide range of import and domestic vehicles. Made from EPDM rubber with a black finish, it uses a single I.D. hose design with 1 1/4-inch inside diameter ends for a direct replacement-style fit.

This Dayco Curved Radiator Hose line is focused on OE-style cooling system service, with SAE J20R4 Class D-1 and SAE J1684 Type EC compliance listed for this part. If you are replacing a worn upper radiator hose on a BMW Z3, Toyota Supra, Mazda 929, or similar application, part number 71178 provides a straightforward match for the specified cooling layout.

Key Features

  • EPDM construction for cooling-system use
  • Black curved radiator hose profile
  • 1 1/4-inch inside diameter at both ends
  • Single I.D. hose design
  • SAE J20R4 Class D-1 and SAE J1684 Type EC listed
  • No heat shield and no protective sleeve
  • Fits upper, lower, and pipe-to-engine/pipe-to-radiator applications listed below

Detailed Description

Dayco 71178 is a radiator coolant hose engineered for vehicles that use a curved hose path in the cooling circuit. The EPDM rubber construction is suited to coolant exposure and underhood temperature demands, while the 1 1/4-inch end diameters support the specified OE-style routing. This hose is listed across a broad range of applications, including upper radiator hose service on the 1996-1998 BMW Z3, upper radiator hose service on the 1990-1998 INFINITI Q45, and upper radiator hose service on the 1986-1992 Toyota Supra.

Additional listed applications include the 1989-1995 Mazda 929, 1991-1995 Toyota MR2 lower pipe-to-engine routing, and 1985-1987 Ford Ranger lower hose service. This part cross-references Gates 20137 and ACDelco 20002S for the same application.

Vehicle Fitment

  • Fits 1996-1998 BMW Z3, Upper
  • Fits 1990-1998 INFINITI Q45, Upper - Radiator To Cap
  • Fits 1989-1998 Mazda MPV, Upper
  • Fits 1988-1995 Mazda 929, Upper
  • Fits 1992-1995 Mazda 929, Lower
  • Fits 1991-1995 Toyota MR2, Lower - Pipe To Engine
  • Fits 1991-1993 Buick Riviera, Upper
  • Fits 1989-1992 Mitsubishi Galant, Upper
  • Fits 1987 Mitsubishi Galant, Upper
  • Fits 1991-1992 Mitsubishi Mirage, Upper
  • Fits 1989 Mitsubishi Mirage, Upper
  • Fits 1991-1992 Mitsubishi Mirage, Lower
  • Fits 1987-1989 Mitsubishi Mirage, Lower
  • Fits 1991-1992 Oldsmobile Toronado, Upper
  • Fits 1989-1992 Toyota Cressida, Upper
  • Fits 1986-1992 Toyota Supra, Upper
  • Fits 1991 Buick Reatta, Upper
  • Fits 1984-1991 Dodge Colt, Upper
  • Fits 1986-1991 Dodge Colt, Lower
  • Fits 1986-1988 Buick Skylark, Upper
  • Fits 1983-1988 Mitsubishi Cordia, Upper
  • Fits 1983-1988 Mitsubishi Tredia, Upper
  • Fits 1988 Oldsmobile Cutlass Calais, Upper
  • Fits 1985-1987 Ford Ranger, Lower
  • Fits 1985-1987 Isuzu Impulse, Upper
  • Fits 1986-1987 Nissan 200SX, Upper - Pipe To Engine
  • Fits 1986-1987 Nissan 200SX, Upper - Pipe To Radiator
  • Fits 1985-1987 Oldsmobile Calais, Upper
  • Fits 1985-1987 Pontiac Grand Am, Upper
  • Fits 1985-1986 Saab 900, Upper - Pipe To Engine
  • Fits 1984-1985 Nissan 200SX, Upper
  • Fits 1982 Pontiac Acadian, Upper
  • Fits 1980 Pontiac Acadian, Upper
  • Fits 1976-1981 Chevrolet Chevette, Upper
  • Fits 1979-1981 Chevrolet Chevette, Upper
  • Fits 1979-1980 Saab 900, Upper - Radiator To Thermostat
  • Fits 1977 Mercury Capri, Upper
  • Fits 1975 Mercury Capri, Upper
  • Fits 1971 Ford E-100 Econoline, Upper

Installation Notes and Tips

  • Verify the hose position before ordering: upper, lower, pipe-to-engine, pipe-to-radiator, or radiator-to-thermostat.
  • Confirm both end diameters match the vehicle connection points at 1 1/4 inches.
  • Inspect clamps, necks, and adjoining coolant pipes for wear before installation.
  • Drain coolant safely and refill the system to the manufacturer’s specification after replacement.
  • Check routing clearance on curved applications such as BMW Z3, Toyota Supra, and Mazda 929 cooling systems.

Quality Assurance

Dayco identifies this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting its use in cooling-system service where those standards are required.

This part fits 152 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionLitersCylindersFuel TypePositionNotes
1998BMWZ3—1.9LL4—UpperCurved Radiator Hose
1998INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1998MazdaMPV————UpperCurved Radiator Hose
1997BMWZ3—1.9LL4—UpperCurved Radiator Hose
1997INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1997MazdaMPV————UpperCurved Radiator Hose
1996BMWZ3————UpperCurved Radiator Hose
1996INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1996MazdaMPV————UpperCurved Radiator Hose
1995INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1995Mazda929————UpperCurved Radiator Hose
1995Mazda929————LowerCurved Radiator Hose
1995MazdaMPV————UpperCurved Radiator Hose
1995ToyotaMR2—2.2LL4—Lower - Pipe To EngineCurved Radiator Hose
1995ToyotaMR2—2.0LL4—Lower - Pipe To EngineCurved Radiator Hose
1994INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1994Mazda929————UpperCurved Radiator Hose
1994Mazda929————LowerCurved Radiator Hose
1994MazdaMPV—3.0LV6—UpperCurved Radiator Hose
1994ToyotaMR2—2.2LL4—Lower - Pipe To EngineCurved Radiator Hose
1994ToyotaMR2—2.0LL4—Lower - Pipe To EngineCurved Radiator Hose
1993BuickRiviera————UpperCurved Radiator Hose
1993INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1993Mazda929————UpperCurved Radiator Hose
1993Mazda929————LowerCurved Radiator Hose
1993MazdaMPV—3.0LV6—UpperCurved Radiator Hose
1993ToyotaMR2—2.2LL4—Lower - Pipe To EngineCurved Radiator Hose
1993ToyotaMR2—2.0LL4—Lower - Pipe To EngineCurved Radiator Hose
1992BuickRiviera————UpperCurved Radiator Hose
1992INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1992Mazda929————UpperCurved Radiator Hose
1992Mazda929————LowerCurved Radiator Hose
1992MazdaMPV—3.0LV6—UpperCurved Radiator Hose
1992MitsubishiGalant————UpperCurved Radiator Hose
1992MitsubishiMirage—1.6LL4—UpperCurved Radiator Hose
1992MitsubishiMirage—1.6LL4—LowerCurved Radiator Hose
1992OldsmobileToronado————UpperCurved Radiator Hose
1992ToyotaCressida————UpperCurved Radiator Hose
1992ToyotaMR2—2.2LL4—Lower - Pipe To EngineCurved Radiator Hose
1992ToyotaMR2—2.0LL4—Lower - Pipe To EngineCurved Radiator Hose
1992ToyotaSupra————UpperCurved Radiator Hose
1991BuickReatta————UpperCurved Radiator Hose
1991BuickRiviera————UpperCurved Radiator Hose
1991DodgeColt—2.0LL4—UpperCurved Radiator Hose
1991DodgeColtAutomatic1.5LL4GASLowerCurved Radiator Hose
1991INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1991Mazda929————UpperCurved Radiator Hose
1991MazdaMPV—3.0LV6—UpperCurved Radiator Hose
1991MitsubishiGalant————UpperCurved Radiator Hose
1991MitsubishiMirage—1.6LL4—UpperCurved Radiator Hose
1991MitsubishiMirage—1.6LL4—LowerCurved Radiator Hose
1991OldsmobileToronado————UpperCurved Radiator Hose
1991ToyotaCressida————UpperCurved Radiator Hose
1991ToyotaMR2—2.2LL4—Lower - Pipe To EngineCurved Radiator Hose
1991ToyotaMR2—2.0LL4—Lower - Pipe To EngineCurved Radiator Hose
1991ToyotaSupra————UpperCurved Radiator Hose
1990DodgeColt—1.8LL4—LowerCurved Radiator Hose
1990DodgeColt—1.6LL4—UpperCurved Radiator Hose
1990DodgeColt—1.6LL4—LowerCurved Radiator Hose
1990DodgeColt—2.0LL4—UpperCurved Radiator Hose
1990INFINITIQ45————Upper - Radiator To CapCurved Radiator Hose
1990Mazda929————UpperCurved Radiator Hose
1990MazdaMPV—3.0LV6—UpperCurved Radiator Hose
1990MitsubishiGalant————UpperCurved Radiator Hose
1990ToyotaCressida————UpperCurved Radiator Hose
1990ToyotaSupra————UpperCurved Radiator Hose
1989DodgeColtAutomatic1.5LL4—LowerCurved Radiator Hose
1989DodgeColt—1.8LL4—LowerCurved Radiator Hose
1989DodgeColt—2.0LL4—UpperCurved Radiator Hose
1989DodgeColt—1.6LL4—UpperCurved Radiator Hose
1989DodgeColt—1.6LL4—LowerCurved Radiator Hose
1989Mazda929————UpperCurved Radiator Hose
1989MazdaMPV—3.0LV6—UpperCurved Radiator Hose
1989MitsubishiGalant————UpperCurved Radiator Hose
1989MitsubishiMirage—1.6LL4—UpperCurved Radiator Hose
1989MitsubishiMirage—1.6LL4—LowerCurved Radiator Hose
1989ToyotaCressida————UpperCurved Radiator Hose
1989ToyotaSupra————UpperCurved Radiator Hose
1988BuickSkylark—3.0LV6—UpperCurved Radiator Hose
1988DodgeColtAutomatic1.5LL4—LowerCurved Radiator Hose
1988DodgeColt—2.0LL4—UpperCurved Radiator Hose
1988DodgeColt—1.6LL4—LowerCurved Radiator Hose
1988Mazda929————UpperCurved Radiator Hose
1988MitsubishiCordia—2.0LL4—UpperCurved Radiator Hose
1988MitsubishiMirageAutomatic1.5LL4—LowerCurved Radiator Hose
1988MitsubishiMirage—1.6LL4—LowerCurved Radiator Hose
1988MitsubishiTredia—2.0LL4—UpperCurved Radiator Hose
1988OldsmobileCutlass Calais—3.0LV6—UpperCurved Radiator Hose
1988ToyotaSupra————UpperCurved Radiator Hose
1987BuickSkylark—3.0LV6—UpperCurved Radiator Hose
1987DodgeColtAutomatic1.5LL4—LowerCurved Radiator Hose
1987DodgeColt—2.0LL4—UpperCurved Radiator Hose
1987DodgeColt—1.6LL4—LowerCurved Radiator Hose
1987FordRanger—2.3LL4—LowerCurved Radiator Hose
1987IsuzuImpulse—2.0LL4—UpperCurved Radiator Hose
1987MitsubishiCordia—2.0LL4—UpperCurved Radiator Hose
1987MitsubishiGalantAutomatic———UpperCurved Radiator Hose
1987MitsubishiMirageAutomatic1.5LL4—LowerCurved Radiator Hose
1987MitsubishiMirage—1.6LL4—LowerCurved Radiator Hose
1987MitsubishiTredia—2.0LL4—UpperCurved Radiator Hose
1987Nissan200SX—1.8LL4—Upper - Pipe To EngineCurved Radiator Hose
1987Nissan200SX—1.8LL4—Upper - Pipe To RadiatorCurved Radiator Hose
1987OldsmobileCalais—3.0LV6—UpperCurved Radiator Hose
1987PontiacGrand Am—3.0LV6—UpperCurved Radiator Hose
1987ToyotaSupra————UpperCurved Radiator Hose
1986BuickSkylark—3.0LV6—UpperCurved Radiator Hose
1986DodgeColtAutomatic1.5LL4—LowerCurved Radiator Hose
1986DodgeColt—2.0LL4—UpperCurved Radiator Hose
1986FordRanger—2.3LL4—LowerCurved Radiator Hose
1986IsuzuImpulse—1.9LL4—UpperCurved Radiator Hose
1986IsuzuImpulse—2.0LL4—UpperCurved Radiator Hose
1986MitsubishiCordia—2.0LL4—UpperCurved Radiator Hose
1986MitsubishiTredia—2.0LL4—UpperCurved Radiator Hose
1986Nissan200SX—1.8LL4—Upper - Pipe To EngineCurved Radiator Hose
1986Nissan200SX—1.8LL4—Upper - Pipe To RadiatorCurved Radiator Hose
1986OldsmobileCalais—3.0LV6—UpperCurved Radiator Hose
1986PontiacGrand Am—3.0LV6—UpperCurved Radiator Hose
1986Saab900————Upper - Pipe To EngineCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1986ToyotaSupra————UpperCurved Radiator Hose
1985DodgeColt—2.0LL4—UpperCurved Radiator Hose
1985FordRanger—2.3LL4—LowerCurved Radiator Hose
1985IsuzuImpulse—1.9LL4—UpperCurved Radiator Hose
1985IsuzuImpulse—2.0LL4—UpperCurved Radiator Hose
1985MitsubishiCordia—2.0LL4—UpperCurved Radiator Hose
1985MitsubishiTredia—2.0LL4—UpperCurved Radiator Hose
1985Nissan200SX—1.8LL4—UpperCurved Radiator Hose
1985OldsmobileCalais—3.0LV6—UpperCurved Radiator Hose
1985PontiacGrand Am—3.0LV6—UpperCurved Radiator Hose
1985Saab900————Upper - Pipe To EngineCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1984DodgeColt—2.0LL4—UpperCurved Radiator Hose
1984MitsubishiCordia—2.0LL4—UpperCurved Radiator Hose
1984MitsubishiTredia—2.0LL4—UpperCurved Radiator Hose
1984Nissan200SX—1.8LL4—UpperCurved Radiator Hose
1983MitsubishiCordia————UpperCurved Radiator Hose
1983MitsubishiTredia————UpperCurved Radiator Hose
1982PontiacAcadian—1.6LL4—UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1982PontiacAcadian—1.6LL4—Upperw/o A.C., H.D. Rad.; Curved Radiator Hose
1981ChevroletChevette—1.6LL4—UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1981ChevroletChevette—1.6LL4—Upperw/o A.C., H.D. Cool; Curved Radiator Hose
1980ChevroletChevette————UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1980ChevroletChevette————Upperw/o A.C., H.D. Cool; Curved Radiator Hose
1980PontiacAcadian————Upperw/o A.C., H.D. Rad.; Curved Radiator Hose
1980Saab900————Upper - Radiator To ThermostatFits vehicles without air conditioning.; Curved Radiator Hose
1979ChevroletChevette————UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1979ChevroletChevette————Upperw/o A.C., H.D. Cool; Curved Radiator Hose
1979Saab900————Upper - Radiator To ThermostatFits vehicles without air conditioning.; Curved Radiator Hose
1978ChevroletChevette————UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1977ChevroletChevette—1.6LL4—UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1977MercuryCapri—2.8LV6—UpperCurved Radiator Hose
1976ChevroletChevette—1.6LL4—UpperCompatible with vehicles containing air conditioning.; Curved Radiator Hose
1975MercuryCapri—2.8LV6—UpperCurved Radiator Hose
1971FordE-100 Econoline—2.8LL6—UpperCurved Radiator Hose
Directly replaces or cross-references 117 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 20002SACDelco — 20266SACDelco — 22213MACDelco — 22420MACDelco — 22494MACDelco — 22585MACDelco — 24229LAutoZone — C0137Beck/Arnley — 142-4944Beck/Arnley — 142-5297Beck/Arnley — 142-5438Beck/Arnley — 142-5862Beck/Arnley — 142-5878Beck/Arnley — 142-5883Beck/Arnley — 142-6040Beck/Arnley — 142-6044Beck/Arnley — 142-6079Beck/Arnley — 142-6092BMW — 11 53 1 743 535CARQUEST — 20137CARQUEST — 21610CARQUEST — 21980CARQUEST — 22635Chief — C0137Chrysler — MB356505Chrysler — MB356507Chrysler — MB538572Chrysler — MB538631Chrysler — MB605107Datsun/Nissan — 21501-05F00Datsun/Nissan — 21501-18F00Datsun/Nissan — 21501-60U00Datsun/Nissan — 21501-60U10Duralast — D71178Ford — 0CM-8260AFord — 00M-8260AFord — 1BA-8260Ford — ACA5463Ford — D5RY-8260-BFord — E57A-8B273-FBFreshstart — 042Freshstart — 403Freshstart — 464Freshstart — 494Freshstart — 1044Gates — 20137Gates — 21565Gates — 21610Gates — 21752Gates — 21980Gates — 22635Gates — 22865Gates — 23240General Motors — 3521106General Motors — 22531941General Motors — 25518849General Motors — 25519576Goodyear — 60138Goodyear — 61355Goodyear — 61606Goodyear — 62094Isuzu — 8-94122-531-2Isuzu — 8-94425-456-0Lancia — 82284874Lazorlite — L34-2513Massey Ferguson — 3280650M1Mazda — JE15-15-186Mazda — JE48-15-185Mazda — JE48-15-186Mazda — JE96-15-186Mazda — JF03-15-186Mazda — JF03-15-186AMitsubishi — MB221570Mitsubishi — MB222208Mitsubishi — MB356027Mitsubishi — MB356904Mitsubishi — MB356963Mitsubishi — MB538692Mopar — BH730Motorcraft — KM126AMotorcraft — KM318Motorcraft — KM323Motorcraft — KM598Motorcraft — KM733Motorcraft — KM733AMotorcraft — KM734AMotorcraft — KM800Motorcraft — KM802Motorcraft — KM803Motorcraft — KM821Motorcraft — KM847Motorcraft — KM1018NAPA — 715NAPA — 8285NAPA — 8328NAPA — 8443NAPA — 8670NAPA — 9268NAPA — 9500NAPA — 9948Pirelli — H19Pirelli — MR524Saab — 708538Saab — 837227Saab — 8330474Saab — 8383028Saab — 9301599Saab — 9369943Toyota — 16571-31130Toyota — 16571-42010Toyota — 16571-42030Toyota — 16571-74010Toyota — 16571-74140Uniroyal — 432Uniroyal — CH3Uniroyal — MC74White — 33-0077054