[Magallon0820]

Hey guys, back here again..I am starting to hate this car, so right now where I am at it is pretty cold, my 535xi when I turn heater in makes a winding noise only when I turn heater on, soon as I turn it off noise goes away, kinda sounds like power steering pump when it's low on fluid, but it's not that because only happens when heater is running, any idea?

[BimmerHausPerformance]

Does the noise get louder as you turn the fan up? The original filter around the fan breaks down over time and disintegrates into nothing, gets stuck in the fan and makes noise.

[Magallon0820]

No it's like a whining noise like a powersteering pump

[NikMN]

You need to pull blower motor out and check. Bad bearings or blades are full of filter material/leaves