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The BMW Range
5 Series
E39
E39 aircon fan auto on/off even when engine is off
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<blockquote data-quote="selfmech" data-source="post: 386810" data-attributes="member: 3514"><p>If I am not mistaken, two wires supply power to the fan whilst the other small one send the speed signal. Believe processing comes from the ECU various inputs like the coolant temperature sensor and air con pressure sensor to determine the speed the fan should run. I have not seen any controller unit under the glove box but only a huge fuse.</p><p></p><p>Rgds.</p></blockquote><p></p>
[QUOTE="selfmech, post: 386810, member: 3514"] If I am not mistaken, two wires supply power to the fan whilst the other small one send the speed signal. Believe processing comes from the ECU various inputs like the coolant temperature sensor and air con pressure sensor to determine the speed the fan should run. I have not seen any controller unit under the glove box but only a huge fuse. Rgds. [/QUOTE]
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The BMW Range
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E39
E39 aircon fan auto on/off even when engine is off
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