Gates 21837 Radiator Coolant Hose - Lower or Upper

Gates Molded Coolant Hose 21837

Gates 21837 is a molded radiator coolant hose built to OEM-quality specifications for upper and lower cooling-system applications. It uses EPDM construction and a formed shape to match the routing needed on select Mitsubishi, Nissan, Infiniti, Mazda, and Chevrolet vehicles.

The Gates Molded Coolant Hose line covers upper, lower, bypass, heater, and other coolant hose applications, giving technicians a direct replacement option for radiator hose service on vehicles such as the Mitsubishi Diamante, Nissan Sentra, and Chevrolet Corvette.

Key Features

• EPDM rubber construction for coolant-system service
• Molded shape for proper hose routing
• End 1 inside diameter: 1.25 in. (32 mm)
• End 2 inside diameter: 1.38 in. (35 mm)
• Centerline length: 22 in. (559 mm)
• No spring and no quick-connect fittings
• Direct replacement style for upper and lower radiator hose applications

Detailed Description

This radiator coolant hose is part of Gates’ Molded Coolant Hose product line, which is built to replace formed coolant hoses used in radiator and HVAC-related cooling circuits. Gates 21837 is shaped for specific vehicle routing and is listed for upper and lower positions depending on application. Cross-reference part numbers include Dayco 71523 and Continental 62233 for the same application.

Fits 1999-2000 Mitsubishi Diamante, Upper; Fits 1998-1999 Nissan Sentra, Lower; Fits 1995-1998 Nissan 200SX, Lower; Fits 1991-1996 INFINITI G20, Lower; Fits 1990-1991 Chevrolet Corvette, Upper. Additional fitment includes 1995-1997 Mazda MX-6, 1991-1993 Nissan NX, and 1997-1998 Mitsubishi Diamante applications. Gates 21837 is a practical replacement when the original molded hose has aged, softened, cracked, or no longer holds its formed shape.

Common Uses

• Replacing a cracked or leaking upper radiator hose
• Replacing a lower coolant hose with incorrect bend shape
• Restoring coolant flow after hose swelling or collapse
• Correcting hose routing on radiator and HVAC coolant circuits
• Servicing molded hose applications on Mitsubishi Diamante, Nissan Sentra, and Chevrolet Corvette models

Installation Notes

Verify hose routing, end diameters, and centerline length before installation. This hose is molded and may require trimming on applications noted as cut-to-fit. Confirm the vehicle’s position requirement, since listed fitment includes both upper and lower applications. Inspect adjoining clamps, necks, and coolant passages for wear or corrosion before installing the new hose.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for replacement use in cooling-system service. The EPDM construction and formed profile support consistent fitment across the listed vehicle applications.