hi

wonder if anybody knows how the air inside the cabin is refreshed if all windows and vents (re-circulate)are closed?

i have measured co2 levels in a stationary toyota spacia (2l petrol auto available in australia) and they increase rapidly, but if the vehicle is moving the co2 levels drop quickly (if they were high to start with)

i have done the same measurement in a toyota corolla and exaclty the same thing happens.

does the vent slightly open at speed to cause the co2 levels to drop or does the moving air across vehilce create a pressure difference sucking stale air out of vehicle (thru body openings) and thus reducing c02 levels?

i am asking this question because i have a problem with an odorless gas getting into the cabin that is making it impossible to drive long distances (i have opned a thread about this a while ago)

thanks

z




- (#13208) z, 6 Sep 04 22:17

Hello Zelco, nice to see your still with us.
If I remember correctly you have a 2002 SBV townace?

On the old style Townace there are two vents on the tailgate that will allow air out, and there are probably many places at the front for it to get into. What have Toyota said about this issue? and what levels of CO2 are we talking about?

- (#13208) dave Bright (Bournemouth), 7 Sep 04 01:29

Most vehicles have some sort of through ventilation that is not part of the heating/ventilation system. For the very reasons you have, to avoid the cabin area building up with unwanted fumes/gas. In the Townace the tailgate has two grills that are air vents. Saloon cars tend to have a grill line on the parcel shelf, hatchbacks either in a similar position or in the rear side panel/doors.
Works on the airflow sucking air out as you say.
Now where does it comes from? I would guess that atmospheric pressure forces it in any crevice, the flaps on the vents just block the flow they are not air tight.
- (#13208) Clive (Bristol UK), 7 Sep 04 01:41