Dayco 70855 Radiator Coolant Hose - Upper - Pipe To Thermostat
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Dayco
 Curved Radiator Hose

Dayco 70855 Radiator Coolant Hose - Upper - Pipe To Thermostat

Brand Dayco 70855
Position Upper - Pipe To Thermostat
Material Epdm
Color Black
End 1 Inside Diameter 1 1/2
End 2 Inside Diameter 1 3/4
Contains Heat Shield N
Contains Protective Sleeve N
Hose Type Dual i.d. hose
SAE Specification Sae j20r4 class d-1, sae j1684 type ec
Trunk Height 7
Product line Curved Radiator Hose
Fits Ford · 3 vehicles

EPDM construction. Built for coolant-system service with a black finish.

Dual I.D. design. 1 1/2 in. and 1 3/4 in. ends match the listed hose routing.

SAE-spec hose. Built to SAE J20R4 Class D-1 and SAE J1684 Type EC standards.

Cross-references ACDelco 20088S, AutoZone C0904 and CARQUEST 20904 for the same application. See all 15.

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Curved radiator hose for Mustang II

Dayco 70855 is a curved radiator coolant hose built for specific Ford cooling-system routing. It uses EPDM construction and a dual I.D. design to match the listed upper pipe-to-thermostat applications on the Ford Mustang II.

Key features

  • EPDM rubber construction for coolant-system service.
  • Dual I.D. hose design with 1 1/2 in. and 1 3/4 in. inside diameters.
  • Black finish for a clean engine-bay appearance.
  • Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications.
  • Curved hose profile for the listed routing path.

Fitment details

Compatible with 1975-1977 Ford Mustang II, upper - pipe to thermostat. Fits 1975-1976 Ford Mustang II, upper - pipe to thermostat, and 1977 Ford Mustang II, upper - pipe to thermostat, with early curved radiator hose routing noted for 1977 applications. Dayco 70855 is a direct match for the specified cooling connection on these Ford Mustang II vehicles.

What it is used for

  • Replacing a cracked or hardened coolant hose.
  • Restoring proper coolant flow between the pipe and thermostat housing.
  • Addressing leaks at the hose ends.
  • Correcting hose routing on the specified cooling layout.

Installation notes and tips

Verify the end diameters and routing before installation to confirm the hose matches the vehicle’s cooling layout. Inspect the mating tubes, clamps, and thermostat housing for wear or corrosion before fitting the new hose. Dayco 70855 should be installed on the listed upper pipe-to-thermostat application only.

Quality assurance

Dayco manufactures cooling-system hoses to published SAE specifications, including SAE J20R4 Class D-1 and SAE J1684 Type EC. This part cross-references Gates 20904 and Motorcraft KM806 for the same application.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1977FordMustang II5.0LV8Upper - Pipe To ThermostatEarly; Curved Radiator Hose
1976FordMustang II5.0LV8Upper - Pipe To ThermostatCurved Radiator Hose
1975FordMustang II5.0LV8Upper - Pipe To ThermostatCurved Radiator Hose
Directly replaces or cross-references 15 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 20088SAutoZone — C0904CARQUEST — 20904Duralast — A70855Ford — D5ZE-8C153-AAFord — D5ZZ-8260-BFreshstart — 203Gates — 20904General Motors — 2468211General Motors — 2491514Goodyear — 60924Mopar — BH1712Motorcraft — KM806NAPA — 7631Pirelli — MR131