Dayco 71030 Radiator Coolant Hose - Upper

Brand	Dayco 71030
Position	Upper
Material	Epdm
Color	Black
End 1 Inside Diameter	1 1/4
End 2 Inside Diameter	1 9/16
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	22
Product line	Curved Radiator Hose
Fits	Buick, Chevrolet, GMC, Oldsmobile, and Pontiac · 152 vehicles

Curved hose design. Helps route coolant smoothly through the cooling system.

EPDM construction. Built for dependable coolant hose performance and durability.

Dual I.D. hose. Offers two inside diameters for the right hose connection.

Cross-references ACDelco 26065X, Atlas MC91 and Autopar RH456 for the same application. See all 25.

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Dayco 71030 Curved Radiator Hose

Dayco 71030 is a curved upper radiator coolant hose built for select GM full-size cars and trucks from the 1980-1990 model years. It uses EPDM construction and a dual I.D. design to match the cooling system routing and connection sizes required for listed applications.

Key Features

EPDM rubber construction for coolant-system service
Black finish
Dual I.D. hose design
End 1 inside diameter: 1 1/4 in.
End 2 inside diameter: 1 9/16 in.
Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
Curved radiator hose profile for upper hose routing

Product Details

This Dayco Curved Radiator Hose line is built for direct-fit cooling system service where a formed upper hose is required. Part number 71030 is listed for applications such as the Buick LeSabre, Chevrolet Caprice, and Oldsmobile Custom Cruiser, along with additional GM passenger cars and light trucks in the 1980-1990 range. The hose’s EPDM material is selected for coolant exposure, while the dual I.D. configuration supports the different connection diameters used in the specified vehicles. Dayco 71030 is a practical replacement for restoring proper coolant flow in upper radiator hose routing.

This part cross-references Gates 21205 for the same application.

What It Is Used For

Replacing a cracked or softened upper radiator hose
Restoring coolant transfer between the engine and radiator
Addressing leaks at the hose ends or along the hose body
Correcting hose fitment on vehicles with curved upper hose routing
Servicing cooling systems on Buick LeSabre, Chevrolet Caprice, and Oldsmobile Custom Cruiser applications

Installation Notes and Tips

Verify end diameters and routing before installation. This hose is listed as an upper radiator hose for the specified applications, so confirm the vehicle’s cooling layout matches the fitment data. Inspect hose necks, clamps, and adjacent cooling components for wear before installing the replacement hose.

Quality Assurance

Dayco 71030 is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent coolant-hose performance for the listed applications.

This part fits 152 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	# Doors	Liters	Cylinders	Fuel Type	Position	Notes
1990	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1990	Chevrolet	Caprice	—	5.0L	V8	—	Upper	Curved Radiator Hose
1990	Oldsmobile	Custom Cruiser	—	—	—	—	Upper	Curved Radiator Hose
1989	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1989	Chevrolet	Caprice	—	5.0L	V8	—	Upper	Curved Radiator Hose
1989	Oldsmobile	Custom Cruiser	—	—	—	—	Upper	Curved Radiator Hose
1989	Pontiac	Safari	—	—	—	—	Upper	Curved Radiator Hose
1988	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1988	Chevrolet	Caprice	—	5.0L	V8	—	Upper	Curved Radiator Hose
1988	Oldsmobile	Custom Cruiser	—	—	—	—	Upper	Curved Radiator Hose
1988	Pontiac	Safari	—	—	—	—	Upper	Curved Radiator Hose
1987	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1987	Chevrolet	Caprice	—	5.0L	V8	—	Upper	Curved Radiator Hose
1987	Oldsmobile	Custom Cruiser	—	—	—	—	Upper	Curved Radiator Hose
1987	Oldsmobile	Cutlass Supreme	—	5.0L	V8	—	Upper	Curved Radiator Hose
1987	Oldsmobile	Cutlass Supreme	4 Door	5.0L	V8	—	Upper	Curved Radiator Hose
1987	Pontiac	Safari	—	—	—	—	Upper	Curved Radiator Hose
1986	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1986	Chevrolet	Caprice	—	5.0L	V8	—	Upper	Curved Radiator Hose
1986	Oldsmobile	Custom Cruiser	—	—	—	—	Upper	Curved Radiator Hose
1986	Oldsmobile	Cutlass Salon	—	5.0L	V8	—	Upper	Curved Radiator Hose
1986	Oldsmobile	Cutlass Supreme	4 Door	5.0L	V8	—	Upper	Curved Radiator Hose
1986	Pontiac	Parisienne	—	5.0L	V8	—	Upper	Curved Radiator Hose
1985	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1985	Buick	LeSabre	—	5.7L	V8	—	Upper	Curved Radiator Hose
1985	Chevrolet	Caprice	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1985	Chevrolet	Impala	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1985	Oldsmobile	Custom Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1985	Oldsmobile	Custom Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1985	Oldsmobile	Cutlass Supreme	4 Door	5.0L	V8	—	Upper	Curved Radiator Hose
1985	Oldsmobile	Cutlass Supreme	4 Door	5.7L	V8	—	Upper	Curved Radiator Hose
1985	Oldsmobile	Delta 88	—	5.0L	V8	—	Upper	Curved Radiator Hose
1985	Oldsmobile	Delta 88	—	5.7L	V8	—	Upper	Curved Radiator Hose
1985	Pontiac	Parisienne	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1984	Buick	LeSabre	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Chevrolet	Caprice	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Chevrolet	El Camino	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Chevrolet	Impala	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1984	Oldsmobile	98	—	5.0L	V8	—	Upper	Curved Radiator Hose
1984	Oldsmobile	98	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Oldsmobile	Custom Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Oldsmobile	Cutlass Supreme	4 Door	5.0L	V8	—	Upper	Curved Radiator Hose
1984	Oldsmobile	Cutlass Supreme	4 Door	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Oldsmobile	Delta 88	—	5.0L	V8	—	Upper	Curved Radiator Hose
1984	Oldsmobile	Delta 88	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Pontiac	Bonneville	—	5.7L	V8	—	Upper	Curved Radiator Hose
1984	Pontiac	Parisienne	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1983	Buick	LeSabre	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Buick	Regal	4 Door	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Chevrolet	Caprice	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Chevrolet	El Camino	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Chevrolet	Impala	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1983	Chevrolet	Malibu	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	98	—	5.0L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	98	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Custom Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Custom Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Cutlass Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Cutlass Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Cutlass Supreme	4 Door	5.0L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Cutlass Supreme	4 Door	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Delta 88	—	5.0L	V8	—	Upper	Curved Radiator Hose
1983	Oldsmobile	Delta 88	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Pontiac	Bonneville	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Pontiac	Grand LeMans	—	5.7L	V8	—	Upper	Curved Radiator Hose
1983	Pontiac	Parisienne	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1982	Buick	LeSabre	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Buick	Regal	4 Door	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Chevrolet	Caprice	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Chevrolet	Impala	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1982	Chevrolet	Malibu	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	98	—	5.0L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	98	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Custom Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Cutlass Cruiser	—	4.3L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Cutlass Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Cutlass Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Cutlass Supreme	4 Door	4.3L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Cutlass Supreme	4 Door	5.0L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Cutlass Supreme	4 Door	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Delta 88	—	4.3L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Delta 88	—	5.0L	V8	—	Upper	Curved Radiator Hose
1982	Oldsmobile	Delta 88	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Pontiac	Bonneville	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Pontiac	Grand LeMans	—	5.7L	V8	—	Upper	Curved Radiator Hose
1982	Pontiac	Parisienne	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Buick	Century	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Buick	LeSabre	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Buick	LeSabre	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Buick	Regal	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Chevrolet	C10	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Chevrolet	Caprice	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Chevrolet	Impala	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1981	GMC	C1500	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	GMC	C1500 Suburban	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	98	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	98	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Custom Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Custom Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass	—	4.3L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Calais	—	4.3L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Calais	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Cruiser	—	4.3L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Supreme	—	4.3L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Cutlass Supreme	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Delta 88	—	4.3L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Delta 88	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Oldsmobile	Delta 88	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Bonneville	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Bonneville	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Catalina	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Catalina	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Grand Prix	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Laurentian	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Laurentian	—	5.7L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Parisienne	—	5.0L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Parisienne	—	4.3L	V8	—	Upper	Curved Radiator Hose
1981	Pontiac	Parisienne	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Buick	LeSabre	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Chevrolet	C10	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Chevrolet	C10 Suburban	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Chevrolet	Caprice	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1980	Chevrolet	Impala	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
1980	GMC	C1500	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	GMC	C1500 Suburban	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	GMC	C2500 Suburban	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	98	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	98	—	5.0L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Custom Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Custom Cruiser	—	5.0L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass	—	4.3L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Calais	—	4.3L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Calais	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Cruiser	—	4.3L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Cruiser	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Salon	—	4.3L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Salon	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Supreme	—	4.3L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Cutlass Supreme	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Delta 88	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Oldsmobile	Delta 88	—	5.0L	V8	—	Upper	Curved Radiator Hose
1980	Pontiac	Bonneville	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Pontiac	Catalina	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Pontiac	Laurentian	—	5.7L	V8	—	Upper	Curved Radiator Hose
1980	Pontiac	Parisienne	—	5.7L	V8	DIESEL	Upper	Curved Radiator Hose
No rows match your filter.

Directly replaces or cross-references 25 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

ACDelco — 26065XAtlas — MC91Autopar — RH456AutoZone — C1205CARQUEST — 21205Duralast — E71030Freshstart — 177Freshstart — 295Gates — 21205General Motors — 14015733General Motors — 14101511General Motors — 22503634General Motors — 22505268General Motors — 22506954General Motors — 22520397General Motors — 25505268Goodyear — 61092Goodyear — 61093MasterPro — 21205Motorcraft — KM1207Motorcraft — KM1208NAPA — 7916Pirelli — 41093Pirelli — 41159Uniroyal — MC171