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Q: heater fan on 2004 BMW X3

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
heater fan noise when speed of fan is increased
(1) Answer
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Does it sound like something has got caught in the fan or the fan bearings are failing? We frequent see mice building nests causing debris to get jammed in the blower fan and ducting. Removal of the heater fan, inspect for debris and testing it across a battery on a work bench is probably the diagnostic path to follow.