Gates 21651 Radiator Coolant Hose - Upper

Gates 21651 Molded Coolant Hose Overview

The Gates 21651 molded coolant hose is an OE-style radiator coolant hose built for upper cooling system routing on select Mercedes-Benz models. Made from EPDM, it is shaped to match the factory hose path and sized with a 1.37 in. (35 mm) inside diameter at one end, a 1.5 in. (38 mm) inside diameter at the other, and a 10.1 in. (257 mm) centerline length.

Gates Molded Coolant Hose products are engineered for radiator, heater, bypass, and other coolant circuit applications where a formed hose is needed to follow the original routing. This Gates 21651 hose is a direct replacement option for Mercedes-Benz 300E, 300TE, 300CE, 300SE, 300SEL, and 260E upper hose applications.

Key Features

• EPDM construction for coolant-system service
• Molded shape for factory-style routing
• Upper radiator coolant hose application
• End 1 inside diameter: 1.37 in. / 35 mm
• End 2 inside diameter: 1.5 in. / 38 mm
• Centerline length: 10.1 in. / 257 mm
• No spring and no quick-connect fittings
• Direct replacement for select Mercedes-Benz cooling systems

Detailed Description

Built as part of the Gates Molded Coolant Hose line, part number 21651 is formed to match the original upper hose layout on specific Mercedes-Benz vehicles. The molded profile helps maintain proper hose routing in tight engine compartments, while the EPDM material is suited for coolant exposure and everyday thermal cycling. If you are replacing a worn Mercedes-Benz 300E upper radiator hose or servicing a 300TE, 300CE, 300SE, 300SEL, or 260E cooling system, this hose provides the correct molded configuration for the application.

This part cross-references Dayco 71400 for the same application.

What It Helps Address

• Coolant leaks from a cracked or aged upper radiator hose
• Softening, swelling, or collapse in the original hose
• Improper hose routing after prior repairs
• Cooling-system service on a Mercedes-Benz 300E, 300TE, 300CE, 300SE, 300SEL, or 260E
• Replacement of a formed hose that no longer holds its shape

Installation Notes and Tips

Verify hose routing, end diameters, and centerline length against the removed part before installation. Inspect hose clamps, thermostat housing connections, radiator necks, and nearby fittings for corrosion or damage that could affect sealing. Confirm the hose is positioned without twist or tension so the molded shape follows the factory path.

Quality Assurance

Gates manufactures molded coolant hoses to OEM-quality specifications for replacement cooling-system service. Part number 21651 is part of Gates’ molded hose line for upper, lower, bypass, heater, and other coolant applications.

Fitment

• Fits 1993 Mercedes-Benz 300E, Upper
• Fits 1991 Mercedes-Benz 300E, Upper
• Fits 1987-1989 Mercedes-Benz 300E, Upper
• Fits 1990-1993 Mercedes-Benz 300TE, Upper
• Fits 1992 Mercedes-Benz 300CE, Upper
• Fits 1988-1990 Mercedes-Benz 300CE, Upper
• Fits 1990-1991 Mercedes-Benz 300SE, Upper
• Fits 1990-1991 Mercedes-Benz 300SEL, Upper
• Fits 1989 Mercedes-Benz 260E, Upper