URO 11531438633 Expansion Tank to Auxiliary Water Pump Coolant Hose

The URO Parts 11531438633 is a direct-fit replacement coolant hose connecting the expansion tank to the auxiliary water pump on BMW E39 5 Series models. Over time, factory rubber hoses become brittle and prone to cracking from repeated heat cycles, which can result in coolant loss and potential engine overheating. Replacing this hose at the first sign of wear — or as part of a proactive cooling system refresh — is a smart, low-cost way to protect a critical engine system.

Key Features:

• Direct OEM-equivalent replacement for BMW part number 11531438633
• Routes coolant from the expansion tank to the auxiliary water pump
• Engineered to match original equipment dimensions for a precise, leak-free fit
• Constructed from heat- and pressure-resistant rubber for long-lasting durability
• Manufactured to ISO 9000 quality standards
• Sold individually

URO Parts is a trusted name in European automotive replacement components, supplying cooling system parts — including hoses, thermostat housings, water pumps, and expansion tanks — to both the aftermarket and select OEM channels. This hose is also commonly referenced as a water hose or radiator cooling hose. OEM cross-reference: 11 53 1 438 633.