Why do vents default to outside air?

With the cab of the vehicle preasurized with outside air, exhaust fumes
cannot enter the car. As a default outside air ensures carbon monoxide free
air.......................

dale P....................

 

With the cab of the vehicle preasurized with outside air, exhaust fumes
cannot enter the car. As a default outside air ensures carbon monoxide free
air.......................

dale P....................

 

Ummmmm......no, not at all.......

It will ALWAYS be less efficient to dehumidify the outside fresh air
than the inside recirculating air.

Really. Honestly. Truly.

 

Ummmmm......no, not at all.......

It will ALWAYS be less efficient to dehumidify the outside fresh air
than the inside recirculating air.

Really. Honestly. Truly.

 

That's correct, and also open the windows so that the fresh a/c is
blowing the stale inside air out.

That's correct. Once the inside and the outside have equalized, you
roll up the windows and hit recirculate. Now the inside will stay much
cooler than the outside, and will stay much cooler than if it had to
cool and dehumidify the outside air.

 

That's correct, and also open the windows so that the fresh a/c is
blowing the stale inside air out.

That's correct. Once the inside and the outside have equalized, you
roll up the windows and hit recirculate. Now the inside will stay much
cooler than the outside, and will stay much cooler than if it had to
cool and dehumidify the outside air.

 

Cars aren't like modern buildings. ALL cars bring in some fresh air,
even on recirculate.

 

Cars aren't like modern buildings. ALL cars bring in some fresh air,
even on recirculate.

 

even easier is to just roll the wondows down and drive for a mile. that
gets the 140+ degree air out.

Once the interior starts to cool off, *then* switch to

 

even easier is to just roll the wondows down and drive for a mile. that
gets the 140+ degree air out.

Once the interior starts to cool off, *then* switch to

 

From another resident of a hot climate - you will get better (read faster)
results if you let it go into recirc and crack the windows several inches
for the first couple of minutes. The AC will cool faster and convection
(warm air rises) plus whatever breeze there might be will draw the
superheated air out the windows.

 

From another resident of a hot climate - you will get better (read faster)
results if you let it go into recirc and crack the windows several inches
for the first couple of minutes. The AC will cool faster and convection
(warm air rises) plus whatever breeze there might be will draw the
superheated air out the windows.

 

"E. Meyer" wrote

Thanks for that idea - I'll try it. Fortunately, the temperatures around
here in southern Arizona have suddenly cooled to "humane," so really I'm
hoping I don't have to get a chance to try it until next May.

 

"E. Meyer" wrote

Thanks for that idea - I'll try it. Fortunately, the temperatures around
here in southern Arizona have suddenly cooled to "humane," so really I'm
hoping I don't have to get a chance to try it until next May.

 

Bah, this is still unclear to me with no concensus on the best method. It
is agreed that opening/cracking the windows when first driving will evacuate
the heated air, but afterwards there are 2 camps.

1. Start in recirc and then switch to fresh after temp stabilization.
2. Start in fresh and then switch to recirc.

I think 2 is more intuitive and that's what I do!

 

Bah, this is still unclear to me with no concensus on the best method. It
is agreed that opening/cracking the windows when first driving will evacuate
the heated air, but afterwards there are 2 camps.

1. Start in recirc and then switch to fresh after temp stabilization.
2. Start in fresh and then switch to recirc.

I think 2 is more intuitive and that's what I do!

 

"MAT" wrote

That's what *I* do, too. Now, here are excerpts from the (Accord 2004)
MANUAL. Remember that thing?

* If the outside air is humid, select recirculation mode. If the outside
air is dry, select Fresh Air mode.

* If the interior is very warm, you can cool it down more rapidly by
partially opening the windows, turning on the A/C, and setting the fan to
maximum speed in Fresh Air mode.

HAH!

 

"MAT" wrote

That's what *I* do, too. Now, here are excerpts from the (Accord 2004)
MANUAL. Remember that thing?

* If the outside air is humid, select recirculation mode. If the outside
air is dry, select Fresh Air mode.

* If the interior is very warm, you can cool it down more rapidly by
partially opening the windows, turning on the A/C, and setting the fan to
maximum speed in Fresh Air mode.

HAH!

 

How about reading to owner's manual, it's all in there in my book. The
manufacturing
engineers wouldn't have put their recommendations in there if they didn't
think it
would help the owner.

D.

 

How about reading to owner's manual, it's all in there in my book. The
manufacturing
engineers wouldn't have put their recommendations in there if they didn't
think it
would help the owner.

D.