Gates 21958 Radiator Coolant Hose - Upper

Gates 21958 Molded Coolant Hose Overview

The Gates 21958 molded coolant hose is an OE-style radiator coolant hose built for upper cooling system routing. Made from EPDM and formed to a molded shape, it matches the specified centerline length and end diameters for a direct replacement on select Chevrolet Lumina, Oldsmobile Cutlass Supreme, and Pontiac Grand Prix applications.

Gates Molded Coolant Hose line is built around replacement-fit coverage for upper, lower, bypass, heater, and other coolant hose applications, helping reduce the time spent sourcing a radiator hose replacement through the dealer channel.

Key Features

• EPDM construction for coolant-system service
• Molded hose profile for the specified routing
• End 1 inside diameter: 32 mm (1.27 in.)
• End 2 inside diameter: 32 mm (1.27 in.)
• Centerline length: 437 mm (17.2 in.)
• No spring and no quick-connect fittings
• Gates part number 21958

Detailed Product Description

This Gates 21958 radiator coolant hose is a molded upper hose replacement for 1991-1993 Chevrolet Lumina, 1991-1993 Oldsmobile Cutlass Supreme, and 1991-1993 Pontiac Grand Prix. The molded EPDM construction supports the hose shape and dimensions needed for the cooling circuit, while the 32 mm end diameters and 437 mm centerline length align with the listed application requirements. If you are replacing a worn upper radiator hose on a Chevrolet Lumina, Oldsmobile Cutlass Supreme, or Pontiac Grand Prix, this hose provides a direct-fit service part reference under Gates 21958.

This part cross-references Dayco 71641 for the same application.

What This Hose Helps Address

• Cracked or split upper radiator hose
• Coolant leaks at the hose body or connection points
• Softening, swelling, or collapse from age and heat
• Incorrect hose shape or length during radiator hose replacement
• Cooling system service on a 1991-1993 Chevrolet Lumina, Oldsmobile Cutlass Supreme, or Pontiac Grand Prix

Installation Notes and Tips

Verify the hose routing, end diameters, and centerline length against the removed part before installation. Inspect the radiator neck, engine fitting, and clamps for wear or corrosion, and replace any damaged sealing surfaces before refilling the cooling system. After installation, refill with the correct coolant mixture and check for leaks at operating temperature.

Quality Assurance

Gates manufactures molded coolant hoses to OEM-quality specifications for replacement cooling system service. The Gates 21958 is part of the brand’s molded coolant hose line, which covers a wide range of upper, lower, bypass, heater, and other coolant hose applications.