Air circulation option

"Dave Plowman (News)" <dave.TakeThisOut@davenoise.co.uk> wrote in message
news:4d927f970fdave@davenoise.co.uk...
> In article <42eb059d$1_1@news.cybersurf.net>,
> Richard Tomkins <tomkinsr.TakeThisOut@istop.com> wrote:
> > How does it know the outside air is bad?
>
> It just noes.
>
> --
> *Certain frogs can be frozen solid, then thawed, and survive *
>
> Dave Plowman dave.TakeThisOut@davenoise.co.uk London SW
> To e-mail, change noise into sound.

Even as far back as early E32's some BMWs have had particulate matter
sensors that changed the airflow to recirc until either the incoming air was
clean again or a certain number of minutes (8? 20? can't remember quite)
had elapsed and the cabin air was going to be getting stale with CO2 from
respiration.

-Russ.

Bmw's like most high priced cars have an sensor mounted in the air
intkae of your heating system that sniffs the air temp and air quality
and adjust your recurculating flap to open of closed for economy and
quality reasons thats a good thing

Dave Plowman (News) wrote:

> In article <42eb059d$1_1@news.cybersurf.net>,
> Richard Tomkins <tomkinsr DeleteThis @istop.com> wrote:
>
>>How does it know the outside air is bad?
>
>
> It just noes.
>