iridium7777

this is the first car where i can't seem to figure this out or it doesn't seem possible?

i want to set some temperature and turn off fan/ac and just have the air flow through the cabin, with possibility of selecting which position the air flows through.

it doesn't seem possible? it seems like as soon as i hit off, everything gets shut off, and as soon as i select the position for airflow button it turns on the whole vent, you can't make the vent go to less than 1 bar.

is it possible to do this?

same thing with turning the air to re-circ and not having the fan running, in many other cars that i've had it was all possible to do, on the E as soon as you hit the re-circ button it again defaults to some fan speed.

thanks for you answers

Plutoe

Can you advise what modern era automobile fitted with an AC system that you were able to do what you say you would like to do with your MB---please don't advise if the car belonged to an old girlfriends or ex wifes car.


PS: I believe that if you disconnect your fan motor connection you will be able to do what you want to do!!However what mechanism will you use to cool down the car??

iridium7777

2004 honda accord this is possible, 2012 Subaru WRX it's possible, 2016 Toyota highlander this is possible...

by that virtue i'd assume +/- 4 year models of the above specific cars it's possible, at the least.

El Cid

May have misinterpreted your request, but anyway.
Had a Hyundai Azera and you could operate fan only with vents open by turning on AUTO and then turning off the AC. You could then run just the fan. Doesn't work on MB though.
However, and learned this on this site. On 2010's, you turn on the AUTO, push AC button (turns AC off) and then push fan button to desired speed. You can also which level you want, e.g. feet, head, both, feet/defrost, etc. I use this is my car and seems to work.
However, if I have thermostat set on 70 degrees and it gets down to about 60 or lower normal temp, the heat comes on anyway.
This may not help because you seem to want to do some very specific things. I think if you go less than one bar (zero speed), you have in effect closed the vents.
Also, on my car, it will only run in recirculation for a specific period. Then it automatically goes back to outside air.

markgm

I think in the other cars you mention the fan is still spinning, just more slowly. Previously I had an Accord, and I thought its HVAC system was superior to the one in our cars.

thefisch

I thought this is what the windows were for.

At any rate, those other cars may have some air pressure differential that is pulling air through the intake cowl out through the vents even if the fan is off. I haven't seen that in a while myself in a car. Try venting the sunroof to see if that creates negative pressure so air would get pulled through.

Plutoe

I think the OP is actually a middle school student and has created a science project!!

iGeorge

Good evening iridium; I haven't seen that kind of functionality in an MB since my 1998 190e. The other thing that car however, was a vent in the C pillar which drew air out of the cabin. It's possible with the more completely sealed cabins of the newer cars, this function is gone.

iridium7777

ok, i want to clarify something, this is not for cooling the car (although that could work), but mostly for heating the car. For example, when it's not too cold out you can just set the temperature to high, turn off the fan completely and in other cars when you're driving on the highway due to the ram effect you'll just be blowing hot air into the cabin by itself, i don't believe the fan is working in those cars at any lower speed, it's completely off. if you want to block the air out you would press the re-circ button.

iridium7777

you've honestly contributed nothing to this post besides your arrogant, ignorant and annoying comments. can you lay-off?

cadetdrivr

FWIW, all cars have cabin exhaust vents that draw air out of the cabin. The only difference is the actual location as the absence of cabin exhaust vents would prohibit the HVAC fan from providing airflow.

El Cid

I have owned many different makes and don't recall any that functioned in this manner. Of course, I also don't recall ever trying to operate the heater without running the fan.
I do believe that there is some kind of system to draw air out of cars, even when HVAC is off in order to prevent CO poisoning. I have noticed on many cars that even if I haveheat on and vents set to floor, a little cool air may come out of upper vents.

iridium7777

perhaps it's jap vs. euro philosophy, on every japanese car that i had you could essentially flow air into the cabin at any (last) temperature set if you're driving on the highway due to the ram effect alone, unless you specifically pressed the re-circ button to on.

El Cid

Maybe the cabin filter reduces air flow enough to stop the flow of air without using the fan?

thefisch

Considering the air filter comes after the fan, I could see the fan blade slowing down incoming air and thick MB spec filter stopping any remaining air flow. The cabin air filters on my Hondas and Toyotas are the equivalent of a tissue in thickness compared to the much thicker MB filter.

iridium7777

never took apart to look at the MB filter but it's quiet possible that the filter is so thick it's stopping any of the ram effect.