Dayco 71709 Radiator Coolant Hose - Lower - Pipe To Engine

Curved Radiator Hose for OE-Style Cooling Service

Dayco 71709 is a curved radiator coolant hose built from EPDM rubber for dependable coolant transfer in the engine cooling system. It uses a single I.D. hose design with 1 5/16-inch inside diameter ends and a black finish for a clean OE-style replacement.

Compatible With Cadillac STS, SRX, XLR, and CTS applications, as well as select Buick, Pontiac, and Oldsmobile models, this Dayco Curved Radiator Hose supports direct replacement needs where the original hose follows a curved routing path. Dayco 71709 is also a fitment match for lower hose locations on several older GM vehicles.

Key Features

• EPDM construction for cooling-system hose service
• Curved radiator hose profile for routed engine bay layouts
• 1 5/16-inch inside diameter at both ends
• Single I.D. hose design
• Black exterior finish
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco part number 71709

Detailed Description

Dayco 71709 is a radiator coolant hose engineered for vehicles that require a curved hose shape and matching 1 5/16-inch end diameters. The EPDM rubber construction is suited for coolant circulation service, while the SAE J20R4 Class D-1 and SAE J1684 Type EC specifications provide a clear reference for hose construction and performance standards. This hose is listed for 2004-2009 Cadillac SRX, 2004-2009 Cadillac XLR, 2005-2010 Cadillac STS, and 2006-2007 Cadillac CTS, along with select Pontiac Sunbird, Buick Skyhawk, Oldsmobile Firenza, Pontiac J2000 Sunbird, and Pontiac J2000 lower hose applications. This part cross-references Gates 21366 for the same application.

What This Hose Helps Address

• Coolant leaks from a cracked or aged radiator hose
• Softening, swelling, or collapse in an original rubber hose
• Improper hose routing on a curved cooling-system path
• Loss of coolant flow caused by hose deterioration
• Replacement needs for Cadillac STS, SRX, XLR, or CTS cooling service

Installation Notes and Tips

Verify the hose routing, end diameters, and position before installation. This hose is listed for N/A positions on Cadillac applications and lower - pipe to engine positions on select Buick, Pontiac, and Oldsmobile models. Inspect adjoining pipes, clamps, and coolant condition before installing the replacement hose, and confirm the vehicle does not require a heat shield or protective sleeve, as neither is included.

Quality Assurance

Dayco manufactures cooling-system components to published SAE specifications, and this hose is identified with OE-style interchange references for common replacement use. Confirm fitment by year, make, model, and hose position before ordering.