Gates 21150 Radiator Coolant Hose - Lower or Upper - Radiator To Pipe

Gates 21150 Molded Coolant Hose

Gates 21150 is a molded radiator coolant hose built for lower cooling-system routing on select Buick, Cadillac, and Oldsmobile applications. It uses EPDM construction and an internal spring to help maintain hose shape under heat and vacuum conditions.

The Gates Molded Coolant Hose line covers upper, lower, bypass, heater, and other coolant hose applications with OEM-quality specifications. For buyers replacing a lower radiator hose on a 1979-1985 Buick Riviera, Cadillac Eldorado, Cadillac Seville, or Oldsmobile Toronado, this part number provides a direct replacement option without needing to source an OE dealer hose.

Key Features

• Part number: 21150
• Brand line: Gates Molded Coolant Hose
• EPDM rubber construction for coolant-system service
• Molded hose shape for factory-style routing
• Internal spring included
• Centerline length: 16.2 in. (411 mm)
• End inside diameters: 1.5 in. (38 mm) and 1.81 in. (46 mm)
• Lower hose application for select GM vehicles

Detailed Description

Gates 21150 is a molded radiator coolant hose engineered for lower hose replacement on specific 1979-1985 Buick Riviera, Cadillac Eldorado, Cadillac Seville, and Oldsmobile Toronado models. The molded profile supports the original hose routing, while EPDM material is commonly used in cooling-system service for resistance to heat and coolant exposure. The internal spring helps the hose retain its shape in demanding lower-hose applications.

This part cross-references Dayco 71217 for the same application. If you are replacing a lower coolant hose on a 1980-1985 Cadillac Eldorado or a 1979 Buick Riviera, Gates 21150 provides a fitment-specific replacement path. It also matches lower hose needs on 1979-1985 Oldsmobile Toronado and 1980-1985 Cadillac Seville applications listed in the fitment data.

What It Helps Address

• Cracked or deteriorated lower radiator hose
• Coolant leaks at the hose body
• Collapsed hose sections under operating temperature
• Incorrect hose routing after a replacement
• Fitment issues when replacing an OE-style molded hose

Installation Notes

Verify the vehicle year, make, model, and lower-hose routing before installation. Compare the end inside diameters and centerline length to the removed hose to confirm match-up. Inspect adjoining clamps, necks, and coolant passages for wear or corrosion before installing the new hose. After installation, refill and bleed the cooling system according to the vehicle service procedure and check for leaks at operating temperature.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The Gates Molded Coolant Hose line is built to cover a wide range of replacement cooling-hose needs, including lower radiator hose service on the vehicles shown in the fitment data.

Compatible Vehicles

• Fits 1979 Buick Riviera, Lower
• Fits 1980-1985 Buick Riviera, Lower
• Fits 1979 Cadillac Eldorado, Lower
• Fits 1980-1985 Cadillac Eldorado, Lower
• Fits 1980-1985 Cadillac Seville, Lower
• Fits 1979 Oldsmobile Toronado, Lower
• Fits 1980-1985 Oldsmobile Toronado, Lower