Tuesday, 11 August 2015

Why does a car cabin fan need a big resistor?


The blower motor resistor for the cabin fan in a Volvo 850/V70 is so big that it is not even part of the motor. It has its own mounting. Here is a picture:


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Why does the blower require such a large resistor? I have much larger fans in my house that have no such resistor.




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