Dayco 72337 Engine Coolant Bypass Hose

Dayco 72337 Curved Radiator Hose

Dayco 72337 is an engine coolant bypass hose built for cooling-system service on select GM and Saturn applications. This curved radiator hose uses EPDM construction and a single I.D. hose design with 23/32-inch inside diameter at both ends for a direct-fit replacement in the specified vehicles.

Key Features

• EPDM rubber construction for coolant-system durability
• Single I.D. hose with 23/32-inch inside diameter at both ends
• Black finish for OE-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Curved radiator hose profile for the listed applications
• Dayco 72337 replacement hose for cooling-system repair

Application Details

This Dayco curved radiator hose is used as an engine coolant bypass hose on select vehicles, including Fits 2006-2011 Chevrolet Impala, N/A; Fits 2006-2010 Chevrolet Malibu, N/A; Fits 2006-2010 Pontiac G6, N/A; Fits 2006-2009 Chevrolet Uplander, N/A; Fits 2006-2009 Pontiac Montana, N/A; Fits 2008-2009 Saturn Vue, N/A; Fits 2007-2008 Saturn Aura, N/A; Fits 2006-2007 Buick Terraza, N/A; Fits 2006-2007 Chevrolet Monte Carlo, N/A; and Fits 2006-2007 Saturn Relay, N/A. It cross-references General Motors 12589978 for the same application.

What This Hose Helps Address

• Coolant leaks from a cracked or aged bypass hose
• Softening, swelling, or collapse in the cooling hose path
• Loss of coolant flow through the bypass circuit
• Service replacement for a damaged curved radiator hose
• Cooling-system maintenance on Chevrolet Impala, Malibu, and Pontiac G6 applications

Installation Notes

Verify hose routing, end diameters, and vehicle application before installation. Inspect adjoining fittings, clamps, and nearby cooling components for wear or corrosion, and replace any damaged parts during service. Confirm the hose is seated fully and routed without kinks or twist before refilling and bleeding the cooling system.

Quality Assurance

Dayco manufactures this hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and performance standards for cooling-system service.