Dayco 72377 Radiator Coolant Hose - Upper

Dayco Curved Radiator Hose 72377

Dayco 72377 is a curved radiator coolant hose for upper cooling-system routing on select Chevrolet Express and GMC Savana vans. Built from EPDM rubber with a black finish and a protective sleeve, it is shaped for direct replacement service where a formed upper hose is required.

Key Features

• EPDM construction for coolant-hose service
• Curved radiator hose design for upper hose routing
• Single I.D. hose with 1 9/32 in. inside diameter at both ends
• Black exterior with protective sleeve
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco part number 72377 for catalog and cross-reference lookup

Product Details

This Dayco curved radiator hose is engineered for upper radiator coolant flow and formed to match the routing used on select full-size GM vans. The EPDM rubber construction is suited for cooling-system temperatures and coolant exposure, while the protective sleeve adds an extra layer where the hose passes near surrounding components. Dayco 72377 is a direct-fit style replacement for applications calling for a 1 9/32 in. inside diameter at both ends.

Compatible with 2007-2020 Chevrolet Express 2500, upper; 2007-2020 Chevrolet Express 3500, upper; 2007-2014 Chevrolet Express 1500, upper; 2007-2020 GMC Savana 2500, upper; 2007-2020 GMC Savana 3500, upper; and 2007-2014 GMC Savana 1500, upper. This part cross-references Gates 23383 for the same application.

Common Replacement Uses

• Cracked or hardened upper radiator hose
• Coolant seepage at the hose body or formed bends
• Heat-related hose wear near adjacent engine components
• Loss of proper coolant circulation through the upper hose path
• Service replacement for a damaged Chevrolet Express or GMC Savana radiator hose

Installation Notes

Verify hose routing, end diameters, and formed shape against the original part before installation. Inspect clamps, necks, and nearby fittings for corrosion or damage, and confirm the hose sits without twisting once installed. Proper coolant refill and bleed procedures should be followed after service.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator coolant hose applications. The part number 72377 is listed for select Chevrolet Express and GMC Savana upper hose applications from 2007-2020, depending on model.