Dayco 71429 Radiator Coolant Hose - Upper

Dayco 71429 Curved Radiator Hose Overview

The Dayco 71429 curved radiator hose is a dual I.D. coolant hose built for upper radiator routing on select Chevrolet and GMC motor home chassis applications. Made from EPDM and finished in black, it provides the formed shape and size transition needed for proper coolant flow in demanding cooling-system layouts.

Compatible with 1985-1990 Chevrolet P30 upper radiator hose applications and 1985-1990 GMC P3500 upper radiator hose applications, this hose is a direct-fit cooling service part for vehicles that require a curved radiator hose with dual inside diameters.

Key Features

• EPDM construction for coolant-system use
• 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
• Upper radiator hose application for curved routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Cross-references ACDelco 26126X and Gates 21519 for the same application

Product Details

Dayco Curved Radiator Hose 71429 is engineered for cooling-system service where a formed upper hose is required to connect different-size inlet and outlet connections. The EPDM rubber construction is suited for radiator coolant transfer, while the curved profile helps match the original hose path on Chevrolet P30 and GMC P3500 motor home chassis models. If you are replacing a worn or leaking upper hose on a 1985-1990 Chevrolet P30 or 1985-1990 GMC P3500, Dayco 71429 provides the correct dual-diameter configuration for the application.

What This Hose Helps Address

• Coolant leaks from cracked or aged upper radiator hoses
• Softening, swelling, or collapse in the cooling hose
• Improper hose routing on curved radiator connections
• Loss of coolant flow caused by damaged hose walls
• Fitment issues when the radiator and engine connections use different inside diameters

Installation Notes and Tips

Before installation, compare the hose shape, end diameters, and routing against the original part on the vehicle. Inspect hose clamps, radiator necks, and adjoining coolant pipes for wear or corrosion, and replace any damaged sealing surfaces before filling the cooling system. Confirm that the hose is positioned without twists or kinks so coolant can circulate properly.

Fits 1985-1990 Chevrolet P30, Upper; Fits 1985-1990 GMC P3500, Upper.

Quality Assurance

This Dayco radiator coolant hose is manufactured to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for coolant-hose service. The part number 71429 is listed for select Chevrolet P30 and GMC P3500 upper radiator hose applications.