BMW Repair Questions? Ask a Mechanic for Answers ASAP
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the most likely cause of this issue on your car is a failed water pump
this can easily be confirmed by having the faults read from the car's computer.
another possibly cause would be a faulty thermostat, faulty temp sensor or air in the cooling system, but more than likely the water pump is the issue. If you are replacing the water pump, be sure to replace the thermostat at the same time.
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I can see that you have rated my answer as "bad"
this PUNISHES me for answering your question and trying to help
can you pleaes clarify what part of your question was not answered?
Dear Mr Expert
My apologies I did not intend to give you a bad mark ,I pressed a button and it sent whatever was on the screen oops !
I have fitted a new thermostat and the problem seemed to be solved but after 25 miles the overheat light came on again,I know BMW's are notorious for getting rid of airlocks do you think this could be my problem?