From: Mike N. 

On Mon, 28 Aug 2006 17:39:55 -0400, "Mark"
 wrote:

>anyway I knew it'd had been awhile since
>the air filter was changed so I said yes to that and they came up with the
>PCV (that's probably what they had for you -- positive crankcase
>ventilation)

  I don't remember the exact term they used, but it was to filter the
passenger compartment air vent.  Of course they went into the big scare
about all the molds, pollens, and dust that you breathe from the incoming
air.

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