Root cause insight into the common BMW blower motor resistor failures
In message
,
" writes
That "something" could be as simple as a diode. PWM is
commonly used to vary the power to a motor. BMW, for
example, uses it on the aux fan motor of the X5. And I
would suspect that it's also used for the blower motor
because you wind up wasting a lot less power that way.
And every little bit of power saved adds up and effects MPG.
I agree with all you say.
--
Clive
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