Dayco 72038 Radiator Coolant Hose - Lower

Curved Lower Radiator Hose for GM Applications

Dayco 72038 is a curved radiator coolant hose built for lower cooling-system routing on select GM vehicles. Made from EPDM rubber and finished in black, it provides a direct-fit replacement for applications that require a 1 1/4 in. inside diameter at both ends.

Compatible With 1994-1999 Chevrolet Lumina, lower; 1995-1999 Chevrolet Monte Carlo, lower; 1994-1997 Oldsmobile Cutlass Supreme, lower; 1994-1996 Buick Regal, lower; and 1994-1996 Pontiac Grand Prix, lower. This Dayco 72038 hose is a fitment-based replacement for vehicles that use a curved lower radiator hose in the cooling circuit.

Key Features

• EPDM construction for coolant-hose service
• Curved radiator hose profile for lower hose routing
• 1 1/4 in. inside diameter at both ends
• Black finish for a factory-style appearance
• Single I.D. hose design
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Product Details

Dayco Curved Radiator Hose 72038 is engineered as a lower radiator coolant hose for GM passenger cars that require a curved hose shape and matching 1 1/4 in. end diameters. The EPDM rubber construction is suited for coolant exposure and routine thermal cycling in the engine bay. This part number is also referenced by interchange listings including Gates 23228 and NAPA 9917 for the same application.

Use Dayco 72038 when replacing a worn, cracked, swollen, or leaking lower radiator hose on a Chevrolet Lumina, Chevrolet Monte Carlo, Oldsmobile Cutlass Supreme, Buick Regal, or Pontiac Grand Prix. The curved profile helps match the original hose routing in vehicles with this cooling-system layout.

Common Replacement Reasons

• Coolant seepage at the hose body or ends
• Cracking, hardening, or soft spots in the rubber
• Swelling from age, heat, or coolant exposure
• Collapsed hose sections that restrict coolant flow
• Incorrect hose shape or diameter during prior repairs

Installation Notes and Tips

Verify the lower hose routing, end diameters, and vehicle application before installation. Inspect the radiator neck, water pump outlet, and clamps for corrosion or wear, and replace damaged clamps as needed. Confirm that the hose is seated fully on both connections and that the cooling system is properly filled and bled after service.

Quality Assurance

Dayco manufactures cooling-system hoses to meet published SAE specifications for material and performance requirements. Part number 72038 is built for the listed GM fitments and cooling-system dimensions.