Gates 21651 Radiator Coolant Hose - Upper

Overview of Gates Molded Coolant Hose 21651

The Gates Molded Coolant Hose 21651 is designed specifically for select Mercedes-Benz models, including the 260E, 300CE, 300E, 300SE, 300SEL, and 300TE. Engineered from durable EPDM material, this radiator coolant hose ensures reliable performance in your vehicle's cooling system.

• Constructed from high-quality EPDM for heat and chemical resistance
• Molded design for precise fit and secure installation
• End 1 inside diameter: 1.37 inches (35 mm)
• End 2 inside diameter: 1.5 inches (38 mm)
• Centerline length of 10.1 inches (257 mm)
• Contains no internal spring, ensuring smooth coolant flow
• Compatible with multiple Mercedes-Benz models from the late 20th century

Details on the Molded Coolant Hose Product Line

The Molded Coolant Hose line by Gates focuses on delivering hoses that are pre-formed to exact specifications, reducing installation time and improving fitment accuracy. This product line emphasizes durability and resistance to common coolant system stresses, making it suitable for vehicles requiring precise hose configurations like the Mercedes-Benz 300SE and 300TE. The molded construction helps maintain hose shape under pressure and temperature variations.

Technical Description of Part Number 21651

Part number 21651 is a radiator coolant hose made from EPDM, a synthetic rubber known for its excellent resistance to heat, ozone, and coolant chemicals. The hose features two different inside diameters at each end—1.37 inches (35 mm) on one side and 1.5 inches (38 mm) on the other—allowing it to connect specific radiator and engine fittings securely. With a centerline length of 10.1 inches (257 mm), this molded hose is designed to fit the cooling system layout of compatible Mercedes-Benz models without the need for modification. The absence of an internal spring ensures unobstructed coolant flow, reducing the risk of blockages or pressure drops.

Applications and Common Issues Addressed

• Replacement of worn or cracked radiator coolant hoses in Mercedes-Benz 260E, 300CE, 300E, 300SE, 300SEL, and 300TE
• Prevention of coolant leaks caused by hose degradation or improper fit
• Restoration of proper coolant flow to avoid engine overheating
• Elimination of hose collapse under vacuum or pressure due to molded design
• Addressing coolant system failures related to hose material fatigue

Installation Notes and Tips

Ensure the engine is cool before removing the old hose to prevent burns or coolant spills. Verify that the hose ends match the radiator and engine fittings by checking the inside diameters (1.37 inches and 1.5 inches). Use appropriate clamps to secure the hose without over-tightening, which can damage the EPDM material. Inspect surrounding components for wear or damage during installation. The molded shape of the hose should align naturally with the vehicle’s coolant routing to avoid kinks or stress points.

Quality Assurance and Warranty

Gates Molded Coolant Hose 21651 is manufactured to meet OEM specifications for Mercedes-Benz vehicles, ensuring compatibility and durability. The EPDM material provides resistance to heat, ozone, and coolant chemicals, contributing to long service life. While specific warranty details are not provided here, Gates products typically come with a limited warranty against defects in material and workmanship. Consult product documentation or authorized distributors for exact warranty terms.