Gates 21345 Radiator Coolant Hose - Upper
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Gates
 Molded Coolant Hose

Gates 21345 Radiator Coolant Hose - Upper

Brand Gates 21345
Position Upper
0
Yes
Branch Quantity 0
Centerline Length 21.6
Centerline Length 549
Contains Spring No
End 1 Inside Diameter 1.26
End 1 Inside Diameter 32
End 2 Inside Diameter 1.5
End 2 Inside Diameter 38
Material EPDM
Modular Hose No
Molded Yes
Number of Quick Connect Fittings 0
Product line Molded Coolant Hose
Fits Chevrolet, GMC, and Pontiac · 34 vehicles

OEM-quality specifications. Built as a molded coolant hose for dependable replacement fit.

EPDM construction. Resists heat and coolant exposure for long service life.

Molded design. Helps route coolant cleanly through complex hose paths.

Cross-references Dayco 71160, Dayco 71242 and Eastern Catalytic 41243 for the same application. See all 20.

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Gates 21345 Molded Coolant Hose Overview

Gates 21345 is a molded radiator coolant hose built to OEM-quality specifications for upper coolant routing on select Chevrolet, Pontiac, and GMC applications. Made from EPDM, it provides the formed shape and correct end sizes needed for a direct replacement on listed vehicles.

The Gates Molded Coolant Hose line covers upper, lower, bypass, heater, and other coolant applications, helping reduce the time spent sourcing a radiator hose replacement. Part number 21345 is listed for 1982-1986 Chevrolet Camaro and Pontiac Firebird applications, plus 1985-1986 Chevrolet S10, S10 Blazer, GMC S15, and GMC S15 Jimmy upper hose positions.

Key Features

  • EPDM construction for coolant-system use
  • Molded hose design for the listed upper hose applications
  • End 1 inside diameter: 1.26 in. (32 mm)
  • End 2 inside diameter: 1.5 in. (38 mm)
  • Centerline length: 21.6 in. (549 mm)
  • No spring, no branch fittings, and no quick-connect fittings
  • Direct replacement reference for Gates 21345

Detailed Product Description

Gates 21345 is a molded radiator coolant hose engineered for vehicles that require a shaped upper hose rather than a universal straight section. Its EPDM material is suited for coolant service, while the molded profile helps match the routing used on the listed Chevrolet Camaro, Pontiac Firebird, Chevrolet S10, Chevrolet S10 Blazer, GMC S15, and GMC S15 Jimmy applications. This part cross-references Dayco 71160 and 71242 for the same application.

Compatible With 1982-1985 Chevrolet Camaro, upper; 1984-1985 Chevrolet Camaro, upper; 1986 Chevrolet Camaro, upper; 1982-1985 Pontiac Firebird, upper; 1984-1985 Pontiac Firebird, upper; 1986 Pontiac Firebird, upper; 1985-1986 Chevrolet S10, upper; 1985-1986 Chevrolet S10 Blazer, upper; 1985-1986 GMC S15, upper; and 1985-1986 GMC S15 Jimmy, upper.

What This Hose Helps Address

  • Cracked or aged upper radiator hose material
  • Coolant leaks at the hose body or ends
  • Incorrect hose shape on routed upper coolant lines
  • Fitment issues when replacing a molded OEM-style hose
  • Service delays caused by searching for the correct formed hose

Installation Notes and Tips

Verify the vehicle year, make, model, and upper hose routing before installation. Some listed Camaro and Firebird applications note cut-to-fit use on vehicles without air conditioning, so confirm the exact cooling and HVAC configuration before ordering. Inspect hose clamps, necks, and adjoining coolant components for wear before installing Gates 21345.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The Gates Molded Coolant Hose product line is built to cover a broad range of replacement coolant hose needs, including upper radiator hose service on classic GM platforms.

Related reading

This part fits 34 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
1986ChevroletCamaro2.5LL4GASUpperCut-to-fit for vehicles without air conditioning; Molded Coolant Hose
1986ChevroletS102.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1986ChevroletS10 Blazer2.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1986GMCS152.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1986GMCS15 Jimmy2.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1986PontiacFirebird2.5LL4GASUpperCut-to-fit for vehicles without air conditioning; Molded Coolant Hose
1985ChevroletCamaro2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1985ChevroletCamaro2.5LL4GASUpperWithout Air Conditioning; With Air Conditioning; Molded Coolant Hose
1985ChevroletCamaro2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1985ChevroletS102.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1985ChevroletS10 Blazer2.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1985GMCS152.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1985GMCS15 Jimmy2.5LL4GASUpperRadiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1985PontiacFirebird2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1985PontiacFirebird2.5LL4GASUpperWithout Air Conditioning; With Air Conditioning; Molded Coolant Hose
1985PontiacFirebird2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1984ChevroletCamaro2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1984ChevroletCamaro2.5LL4GASUpperWithout Air Conditioning; With Air Conditioning; Molded Coolant Hose
1984ChevroletCamaro2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1984PontiacFirebird2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1984PontiacFirebird2.5LL4GASUpperWithout Air Conditioning; With Air Conditioning; Molded Coolant Hose
1984PontiacFirebird2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1983ChevroletCamaro2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1983ChevroletCamaro2.5LL4GASUpperW/X.C. - Radiator Coolant Hose.; Molded Coolant Hose
1983ChevroletCamaro2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1983PontiacFirebird2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1983PontiacFirebird2.5LL4GASUpperW/X.C. - Radiator Coolant Hose.; Molded Coolant Hose
1983PontiacFirebird2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1982ChevroletCamaro2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1982ChevroletCamaro2.5LL4GASUpperW/X.C. - Radiator Coolant Hose.; Molded Coolant Hose
1982ChevroletCamaro2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
1982PontiacFirebird2.5LL4GASUpperHVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1982PontiacFirebird2.5LL4GASUpperW/X.C. - Radiator Coolant Hose.; Molded Coolant Hose
1982PontiacFirebird2.5LL4GASUpperFitment: Fits vehicles without air conditioning, with standard cooling, and requires cutting to fit.; Molded Coolant Hose
Directly replaces or cross-references 20 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Dayco — 71160Dayco — 71242Eastern Catalytic — 41243Gates — 21345Hayden — 27177-8767-4804624139L6124310021572100215731559853351313860C1345D71242E71160KM-1429MH-4345MH578XE71160