Dayco 71983 Radiator Coolant Hose - Lower

Dayco Curved Radiator Hose for Corvette Cooling Service

Dayco Part Number 71983 is a curved radiator coolant hose built for the lower cooling circuit on select Chevrolet Corvette applications. Made from EPDM with a black finish, it uses a dual I.D. hose design and includes a protective sleeve for added abrasion resistance in the engine bay.

Compatible with 1997-2008 Chevrolet Corvette, lower, this hose is specified for vehicles that need a curved radiator hose with different inside diameters at each end. The Dayco Curved Radiator Hose line focuses on application-specific routing and OE-style fitment for cooling system service.

Key Features

• EPDM construction for coolant-system durability
• Black finish for a clean OE-style appearance
• Dual I.D. hose design with 1 1/4 in. end 1 and 1 1/2 in. end 2 inside diameters
• Protective sleeve included for added surface protection
• Curved radiator hose profile for lower hose routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Detailed Description

Dayco 71983 is a radiator coolant hose engineered for lower hose service on the Chevrolet Corvette. Its EPDM rubber construction is suited for cooling system use, while the dual I.D. layout addresses applications that require different connection sizes at each end. The curved shape supports the routing needed in the lower radiator position, and the protective sleeve adds an extra layer where the hose may contact nearby components. This part cross-references Gates 22405 for the same application.

Fits 1997-2008 Chevrolet Corvette, lower. If you are replacing a worn or leaking lower radiator hose on a Corvette, Dayco 71983 provides the correct fitment profile for this application.

Common Problems This Hose Can Address

• Coolant leaks from a cracked or aged lower radiator hose
• Softening, swelling, or deterioration of the original EPDM hose
• Improper hose routing on the lower cooling circuit
• Fitment issues caused by mismatched hose end diameters
• Surface wear where the hose contacts nearby engine bay components

Installation Notes and Tips

Before installation, compare the hose end diameters and routing to the removed part to confirm the lower position application. Inspect hose clamps, radiator necks, and adjoining coolant pipes for corrosion, residue, or damage before reassembly. After installation, refill and bleed the cooling system according to the vehicle service procedure and check for leaks at operating temperature.

Quality Assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent material and performance requirements for coolant hose service.