Dayco 81491 Radiator Coolant Hose - Lower or Upper

Dayco Flex Radiator Hose 81491

Dayco 81491 is a Flex Radiator Hose for upper and lower cooling-system applications on a wide range of classic and early-1990s vehicles. It is listed for select Chevrolet, Ford, GMC, Chrysler, Buick, Oldsmobile, Pontiac, Lincoln, and Dodge models, including upper radiator hose applications on vehicles such as the Chevrolet Camaro, Ford Aerostar, and GMC C/K trucks.

Key Features

• Dayco Flex Radiator Hose, part number 81491
• Upper and lower radiator hose fitments listed by vehicle application
• Direct fit coverage for many vehicles with air conditioning
• Application coverage spans 1966-1992 model years
• Cross-references Gates 26443 for the same application

Application Details

This radiator coolant hose is cataloged for 227 vehicle applications across 1966-1992. Fitment includes upper hose positions on the 1970-1979 Chevrolet Camaro, 1973-1977 Ford Bronco, 1979 GMC C1500, and 1990-1992 Ford Aerostar, plus lower hose applications on the 1992 Chevrolet Lumina APV, 1992 Oldsmobile Silhouette, and 1992 Pontiac Trans Sport. The Dayco Flex Radiator Hose line is used where a formed coolant hose is needed to route engine coolant between the radiator and engine while matching the listed vehicle configuration.

What It Helps Fix

• Cracked or split radiator hose material
• Coolant leaks at the upper or lower hose connection
• Soft, swollen, or collapsed coolant hose sections
• Restricted coolant flow caused by hose deterioration
• Overheating concerns tied to a failing radiator coolant hose

Installation Notes and Tips

Verify the listed year, make, model, and hose position before installation. Match the application notes carefully, especially vehicles noted for air conditioning or long-body radiator configurations. Inspect hose clamps, radiator necks, and engine fittings for wear or corrosion before installing the new hose. Confirm routing and clearance so the hose follows the original path without kinks or contact points.

Quality Assurance

Dayco 81491 is cataloged as a Flex Radiator Hose with broad OE-style application coverage for classic and early-1990s cooling systems. This part cross-references Gates 26443 for the same application.