HomeBelts and Cooling > Hoses and PipesGates 51821 Radiator Coolant Hose - Upper
Part #: 51821

Gates 51821 Radiator Coolant Hose - Upper

Molded Coolant Hose, Upper
⚙️ 20 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
📦Molded Coolant Hose, Upper
🚗Fitment: Subaru, Crosstrek, Impreza, and XV
🔄Easy Returns — Return within 60 days for a full refund
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Reliable Radiator Coolant Hose for Subaru Vehicles

The Gates Molded Coolant Hose 51821 is designed specifically for Subaru Crosstrek, Impreza, and XV models. Constructed from durable EPDM material, this radiator coolant hose ensures consistent performance and longevity in your vehicle's cooling system.

  • Made from high-quality EPDM rubber for heat and chemical resistance
  • Exact fit for Subaru Crosstrek, Impreza, and XV models
  • Centerline length of 12.2 inches (310 mm) for precise installation
  • Uniform inside diameter of 1.46 inches (37 mm) on both ends
  • Does not contain a spring, ensuring flexibility and durability

About the Gates Molded Coolant Hose Product Line

The Molded Coolant Hose line by Gates offers pre-formed hoses engineered to match the original equipment specifications. These hoses provide a reliable seal and fit, reducing the risk of leaks and cooling system failures. The 51821 part number is part of this line, designed to meet the exact requirements of Subaru vehicles for optimal coolant flow and system integrity.

Product Details and Specifications

This radiator coolant hose features a consistent inside diameter of 1.46 inches (37 mm) on both ends, ensuring compatibility with the corresponding radiator and engine fittings. The 12.2-inch (310 mm) centerline length allows for a precise fit within the cooling system layout of Subaru Crosstrek, Impreza, and XV models. Made from EPDM, the hose resists heat, ozone, and coolant chemicals, contributing to a longer service life. The absence of an internal spring enhances flexibility without compromising structural integrity.

Common Applications and Problem Solving

  • Replacement of worn or cracked radiator coolant hoses in Subaru Crosstrek, Impreza, and XV
  • Prevention of coolant leaks that can lead to engine overheating
  • Restoration of proper coolant flow within the vehicle's cooling system
  • Addressing hose swelling or softening caused by heat and chemical exposure
  • Ensuring a secure connection between radiator and engine components

Installation Notes and Tips

Before installation, ensure the engine is cool to avoid injury from hot coolant. Inspect hose connections and clamps for wear and replace if necessary. The Gates Molded Coolant Hose 51821 is designed for direct replacement, so no modifications are required. Properly secure clamps to prevent leaks and verify hose routing matches the original configuration to avoid kinks or interference.

Quality Assurance and Warranty

Gates manufactures the Molded Coolant Hose 51821 to meet stringent quality standards, ensuring durability and reliable performance. The EPDM material is selected for its resistance to heat and coolant chemicals. While specific warranty details are not provided here, Gates products typically come with manufacturer-backed quality guarantees. Refer to official Gates documentation for warranty terms.

BrandGates
Part Number51821
PositionMolded Coolant Hose, Upper
MaterialEpdm
End 1 Inside Diameter1.46
End 1 Inside Diameter37
End 2 Inside Diameter1.46
End 2 Inside Diameter37
Contains SpringNo
Centerline Length12.2
Centerline Length310
Branch Quantity0
9839Yes
98450
9940No

This part fits 20 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2025SubaruCrosstrek2.0LH4GASUpperMolded Coolant Hose
2025SubaruImpreza2.0LH4GASUpperMolded Coolant Hose
2024SubaruCrosstrek2.0LH4GASUpperMolded Coolant Hose
2024SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2023SubaruCrosstrek2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2023SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2022SubaruCrosstrek2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2022SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2021SubaruCrosstrek2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2021SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2020SubaruCrosstrek2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2020SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2020SubaruXV2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2019SubaruCrosstrek2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2019SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2019SubaruXV2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2018SubaruCrosstrek2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2018SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2018SubaruXV2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose
2017SubaruImpreza2.0LH4GASUpperAvailable Until Stock Depleted; Molded Coolant Hose

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

45161FL00045161FL00A51821F11557

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.