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This hose runs from the auxiliary water pump and valve to the heater core on the E53 X5. As rubber hoses can become hard and split, causing expensive engine problems, we recommend periodic replacement. OE-Qaulity hose from Rein.
Make sure you have enough coolant on hand prior to starting the job.
Please note: Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice