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This has just started happening to my 2012 BMW 135i. When my A/C is on, I can hear the radiator fan speeding up and down like crazy in regular intervals. When I parked my car, I tested to see if the same symptoms were there after I turned off A/C. The fan stopped ramping up and down like crazy.
Does this sound like a waterpump and/or thermostat issue as well? Should I bring my car to the dealer or wait till I get some kind of alert in the car? I know it's not normal.
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