I have a manual AC and I don't really experience the issue: after driving more than 30 minutes (more than an hour sometimes) with AC off, heater off, windows closed the cabin air feels of ambient (cool) temperature. Yet, taking it strictly, it does get slightly warmer than the outside after a prolonged drive. So it must be the ambient temperature that matters: in cool weather (around +10 C) it's all right, when it's warm/hot outside I do use the AC always.
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Kiwi: I thought the manual AC doesn't have a cabin filter.
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Of course, there's always a cabin air filter. Did you really expect BMW to make you breathe the dust? That would be just inhuman.
Let's look at the manual:
http://f20.1addicts.com/forums/attac...3&d=1355853796.
Page 117, Climate | Air conditioning | Mircrofilter:
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the microfilter filters dust and pollen from the air
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versus
Page 120, Climate | Automatic air conditioning | Microfilter/activated charcoal filter:
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the microfilter/activated carbon filter filters dust, pollen and harmful gases from the air
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The only difference is the technology: activated charcoal filter for the auto AC is better (and more expensive). People say they are interchangeable. (I did not mind it myself when getting mine changed. Just watched the procedure to make sure they really did it. And
it was there.)
Here's how to find out if it's there in the car:
http://www.youtube.com/watch?v=z2W4iAJ7IZY.
And here's the manual if you want to explore/change it yourself (VERY awkward to do, I finally had to pay):
http://catalog.mann-filter.com/media...g/HBsgWmHb.pdf. If changing the filter yourself, please mind it's proper ("air flow") positioning.
Happy driving!