BMW Repair Questions? Ask a Mechanic for Answers ASAP
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the most likely cause is a faulty water pump
other possible causes would be a faulty thermostat, faulty fan, blockage / airlock in the cooling system or blown head gasket
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
Thank you Steve,
Will have to have it checked, beyond my competence.