Dayco 71691 Radiator Coolant Hose - Lower or Upper

Dayco Curved Radiator Hose 71691 Overview

Dayco 71691 is a curved radiator coolant hose built for upper and lower cooling system routing where a formed EPDM hose is required. It is a black, single I.D. hose with 1 9/32-inch inside diameter at both ends, made to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications.

Compatible With 1995-1998 Honda Odyssey, upper and 1996-1999 Isuzu Oasis, upper, this Dayco Curved Radiator Hose supports direct replacement needs for select OE-style cooling layouts. The Dayco 71691 is also cross-referenced to common aftermarket and OE numbers for the same application.

Key Features

• EPDM construction for radiator coolant service
• Curved hose profile for formed cooling-system routing
• Single I.D. hose design with 1 9/32-inch inside diameter at both ends
• Black finish for a clean OE-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC standards
• Compatible With upper and lower radiator hose applications listed below

Product Details

Dayco Curved Radiator Hose 71691 is engineered as a replacement coolant hose for vehicles that use a shaped hose path between the engine and radiator. EPDM rubber is commonly used in cooling systems because it handles coolant exposure and temperature cycling well, while the curved form helps match factory hose routing. This part number is listed for 1995-1998 Honda Odyssey, upper; 1996-1999 Isuzu Oasis, upper; 1994-1996 Buick Century, lower; 1994-1996 Oldsmobile Cutlass Ciera, lower; and 1994 Oldsmobile Cutlass Cruiser, lower.

This part cross-references Honda 19501-P1E-000 and Isuzu 5-86202-386-0 for the same application.

Common Problems This Hose Can Address

• Coolant leaks from a cracked or aged radiator hose
• Softening, swelling, or collapse in the original hose
• Improper hose routing after a previous repair
• Loss of cooling-system pressure from hose deterioration
• Overheating caused by restricted coolant flow through a damaged hose

Installation Notes and Tips

Verify hose routing, end diameters, and position before installation. Compare the existing hose shape to the curved profile of Dayco 71691 and confirm whether the application is upper or lower on your vehicle. Inspect hose clamps, radiator necks, and thermostat housing connections for wear or corrosion before installing the new hose.

For best results, install on a cool engine, drain coolant as needed, and check the system for leaks after refill and warm-up. Confirm fitment for your specific Honda Odyssey, Isuzu Oasis, Buick Century, Oldsmobile Cutlass Ciera, or Oldsmobile Cutlass Cruiser application before service.

Quality Assurance

Dayco manufactures this radiator coolant hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and dimensional standards for cooling-system replacement.