Dayco 71624 Engine Coolant Bypass Hose

Dayco Curved Radiator Hose 71624

Dayco 71624 is an engine coolant bypass hose built for cooling-system service on select Buick, Chevrolet, Oldsmobile, and Pontiac vehicles. This curved radiator hose uses EPDM construction and a 5/8 in. inside diameter at both ends for a direct-fit replacement in the listed applications.

Key Features

• EPDM rubber construction for coolant-system durability
• Black finish for OE-style appearance
• Single I.D. hose with 5/8 in. inside diameter at both ends
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved radiator hose profile for the specified engine coolant bypass applications
• Dayco part number 71624 for easy identification

Product Details

Dayco 71624 is a curved radiator hose in the Dayco Curved Radiator Hose line, made for coolant bypass routing where a formed hose is required. The EPDM material is selected for use in engine cooling systems, while the 5/8 in. end diameters support the listed fitments across Buick LeSabre, Park Avenue, Regal, Riviera, Century, Skylark, Reatta, and other GM platforms. If you are replacing a worn coolant bypass hose on a Buick Regal or Oldsmobile 98, this hose matches the application-specific shape and sizing called out for those vehicles.

This part cross-references ACDelco 14239S and Gates 21949 for the same application.

What It Helps Fix

• Coolant leaks from a cracked or aged bypass hose
• Softening, swelling, or collapse in the original hose
• Improper coolant routing caused by a damaged formed hose
• Maintenance replacement on aging GM cooling systems
• Fitment issues when the original curved hose no longer seals correctly

Installation Notes

Verify hose routing, end diameter, and formed shape against the removed part before installation. Inspect hose clamps, coolant condition, and nearby fittings for wear or corrosion, and replace any damaged sealing surfaces before refilling the cooling system. Confirm the application against the vehicle listing for Buick, Chevrolet Lumina APV, Oldsmobile 88, 98, Silhouette, and Pontiac Trans Sport models.

Quality Assurance

This Dayco coolant hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for the listed applications. It is a formed EPDM replacement hose for service on 1990-1998 Buick, Chevrolet, Oldsmobile, and Pontiac vehicles, including Buick LeSabre, Oldsmobile 98, and Pontiac Bonneville fitments.