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The BMW Range
3 Series
E90, E91, E92, E93
Recirculated-air mode
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<blockquote data-quote="astroboy" data-source="post: 649390" data-attributes="member: 4527"><p>Correct me if I‘m wrong. E90 has no cabin filter to protect the internal cooling coil. The pollen or microfilter located under the hood, is to filter external odor and dust from getting into the car, before feeding the cooling coil. if we are permanently on internal mode, air passing the cooling coil will bypass the microfilter. Internal air is full of dust and fibre from our clothing and carpet. Your cooling coil will clog and punctured very fast.</p></blockquote><p></p>
[QUOTE="astroboy, post: 649390, member: 4527"] Correct me if I‘m wrong. E90 has no cabin filter to protect the internal cooling coil. The pollen or microfilter located under the hood, is to filter external odor and dust from getting into the car, before feeding the cooling coil. if we are permanently on internal mode, air passing the cooling coil will bypass the microfilter. Internal air is full of dust and fibre from our clothing and carpet. Your cooling coil will clog and punctured very fast. [/QUOTE]
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The BMW Range
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E90, E91, E92, E93
Recirculated-air mode
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