Gates 51525 Radiator Coolant Hose - Thermostat To Engine

BMW Thermostat-to-Engine Coolant Hose

The Gates 51525 molded coolant hose is built for specific BMW cooling system applications where a formed hose route is required between the thermostat and engine. It uses EPDM and plastic construction and follows OE-style dimensions for a direct-fit replacement on listed vehicles.

Gates Molded Coolant Hose is part of the brand’s modular coolant hose line, which is engineered for application-specific fitment and OE-style integration. This hose includes an outlet flange as a modular component and is molded to match the routing and connection points used on the vehicle.

Key Features

• Part number 51525 molded coolant hose for thermostat-to-engine routing
• EPDM and plastic construction for cooling system service
• OE-style molded shape for application-specific fitment
• Centerline length: 10.5 in. (267 mm)
• End 1 inside diameter: 0.95 in. (24 mm)
• End 2 inside diameter: 1.05 in. (27 mm)
• Modular hose design with outlet flange component
• No spring and no quick-connect fittings

Detailed Description

Gates 51525 is a molded radiator coolant hose designed for BMW cooling system service where the hose runs from the thermostat to the engine. The molded profile helps match the factory hose path, while the EPDM and plastic material combination supports use in a hot coolant environment. This part cross-references Rein CHE0542 for the same application.

Compatible BMW applications include 2013-2018 BMW X3, 2018 BMW X5, 2014-2016 BMW 228i, 2015-2016 BMW 228i xDrive, 2015-2016 BMW 328i, 2015-2016 BMW 328i GT xDrive, 2015-2016 BMW 328i xDrive, 2015 BMW 320i, 2015 BMW 320i xDrive, 2013-2015 BMW X1, 2014 BMW 428i, 2014 BMW 428i xDrive, 2014 BMW 528i, and 2014 BMW 528i xDrive, all at the thermostat-to-engine position.

Common Uses

• Replacing a cracked or heat-aged BMW coolant hose
• Restoring coolant flow between the thermostat and engine
• Fixing coolant leaks at a molded hose section
• Replacing a hose with incorrect routing or fitment
• Addressing softening, swelling, or deterioration in the cooling line

Installation Notes and Tips

Verify hose routing, end diameters, and the thermostat-to-engine position before installation. Inspect mating flanges, clamps, and nearby cooling components for wear or residue from prior leaks. Confirm the hose is seated fully and routed without twist or contact against hot or moving parts.

Quality Assurance

Gates is a recognized automotive aftermarket supplier of modular coolant hose assemblies, and this hose is manufactured to application-specific OE-style specifications for listed BMW models. Part number 51525 is built to match the original hose layout and integrated component requirements used in the cooling system.