Automatic A/C - Klimaautomatik

[Werner807HDI]

Hallo Leute,

kann mir bitte einer sagen, ob man die automatische Zuschaltung der Auto-Funktion und der Aircondition bei jedem Einschalten der Zündung abschalten kann und wenn ja wie?

Mich nervt das tierisch, weil ich bei den jetzigen Temperaturen nicht einsehen möchte, dass sich die AC einschaltet.
LG

[DirkS.]

I encountered the same thing! It's really annoying having to switch off the A/C everytime I start the car. I always thought (and that's what the manual states, I think) that the A/C recalls the last setting...

[Holger]

I wonder how much fuel consumption the A/C needs when not cooling down the temparature.

The A/C regulates the overall clima and the humidity which is important to avoid foggy windows from the inside, but I would assume that this function needs less energy thus leading in lower fuel consumption than additionally cooling down the inner temperature.

So why would you need to switch off the automatic mode then ? In general it's working fine, the only thing I complain is the quite strong usage of the blower which gets really loud if it's cold and foggy, most times I manually decrease the blower capacity after a few minutes resulting in an automatic switch-off of the A/C automatic mode. Is it that what you complain ?

[Werner807HDI]

Ja mich ärgert halt nur, dass wenn ich die AC ausschalte und eine gute Einstellung der Regler getroffen habe, die angenehm ist, dass beim nächsten Zündung ausschalten und wieder einschalten die Automatik und die AC angeht.
Ich habe schon früher Autos mit Klimaanlagen gefahren und die Erfahrung gemacht, wenn man die AC auslässt, die Scheiben bei jetzigen Temperaturen nicht anlaufen.
Das ist wie ein Teufelskreis. Macht man die AC an, tauen die Scheiben sehr schnell ab, was gut ist. Ist es aber dann zu kalt und man dreht wärmer oder schaltet sie wieder ab, laufen sie wieder an.

Ausserdem spart man doch erheblich an Treibstoff, wenn man die AC nicht anhat. Auch bei niedrigen Temperaturen und bei trockenem Wetter.
LG

[DirkS.]

@holger:

I was mainly thinking about the fuel consumptiuon. I didn't know that the A/C controls the humidity as well. If the fuel consumption doesn't increase if not cooling, it's fine with me. But I doubt that. What makes you think that the A/C controls the humidity?

[Holger]

The A/C will reduce the amount of humidity by refreshing the air using it's compressor exchanging the inner air with fresh air from the outside which will be regulated in the A/C circuit (thus the name "Aircondition") . This is the reason why the windows won't get clouded. If you just breathe the air gets wet thus leading to a higher humidity, therefore this "used air" needs to get out of the car.

If you switch-off the compressor (frost pattern symbol left from the Auto button) of the A/C the inner air will not be conditioned, just exchanged with air from the outside. But if this air is also quite wet, your windows may still get foggy ! If you press the "Circulate Air" button (top left button) avoiding external air flow, the humidity will quickly get quite high and the windows will get clouded even if the blower is still activated.

I think this is also well described in the cars manual (!).

This is the reason why I usually leave the A/C switched on to get the air regulated by the system and I'm quite satisfied with it's results, esp. in winter - you will see !

[DirkS.]

Originally Posted by holger

If you switch-off the compressor (frost pattern symbol left from the Auto button) of the A/C the inner air will not be conditioned, just exchanged with air from the outside. But if this air is also quite wet, your windows may still get foggy ! If you press the "Circulate Air" button (top left button) avoiding external air flow, the humidity will quickly get quite high and the windows will get clouded even if the blower is still activated.

Ok, if I switch off the compressor, I just let the outer air in as it is. If this air is humid, the humidity inside will increase, too. So what's the difference to having the compressor on? Then the A/C tries to mix humid air from the outside with the humid air from the inside (because of breathing) so the result is humid air.So to my understanding, there's no use to the A/C in winter...

Even not if the outside air is dry. Without A/C I let the dry air in, same with the A/C on. There the only difference I can see is when the outside air is too dry, the A/C mixes it with humid inside air. SO the A/C in winter may help if the air is too dry, not if it's too wet, right?

[Arnd]

I just came back from the kindergarten and checked this. I turned the A/C and Auto-Mode of and stoped the engine. After restarting the engine the A/C and Auto-Mode was still off and everything looked like I've left it.


Arnd

[olspri]

Originally Posted by Arnd

I just came back from the kindergarten and checked this. I turned the A/C and Auto-Mode of and stoped the engine. After restarting the engine the A/C and Auto-Mode was still off and everything looked like I've left it.


Arnd

For my Ulysse it's different, sometimes the Auto AC is off and sometimes on when I start again. I didn't find the reason yet.

Another (or further clearing) point to the function of the AC: It's true that the AC drys/dries(?) the air (Lufttrocknung). I cannot explain exactly why, but this is always the case when using AC. This effect must be somehow related to the cooling of the air. That's the reason why a foggy window will be much earlier clear when using the AC than using only the ventilator. That's also a problem when working e.g. in an airconditioned office. The air is always to dry which is not so good for the health.

Bye

Oliver

[Uwe_rossi]

Originally Posted by Arnd

I just came back from the kindergarten and checked this. I turned the A/C and Auto-Mode of and stoped the engine. After restarting the engine the A/C and Auto-Mode was still off and everything looked like I've left it.


Arnd

you have to look in the manual. there you see that if you leave the car for about 2 hours the options will go back to the basics. I have tested that and I found out that this option is really strange.

[Holger]

@DirkS

Well, I think in the EV2 manual they say that the compressor will also regulate and dry the humid air if it's too humid, independant from the outer clima conditions. But I can't really tell...

I've just searched the net for more details and found the following on this, it's a german (sorry) description with detailed information on the way it works if you click on the image. Maybe this can clear things up a bit:

See

[DirkS.]

Originally Posted by Uwe_rossi

you have to look in the manual. there you see that if you leave the car for about 2 hours the options will go back to the basics. I have tested that and I found out that this option is really strange.

That explains it! I also noticed that sometimes it starts with A/C on, sometimes with A/C off even though I always has A/C switched off when stopping the car!



I also can't explain why airconditioned air is dry. I would expect it to be humid, since warm air holds more water and if you cool it down and the amount of water remains the same per volume, the relative humidity of cold air should go up. So this is not the case, but why?

[Arnd]

As Uwe suggested I looked into the manual. I always do what Uwe tells me I didn't find anything that says that after two hours the aircon turns on by itself. What I did find is a remark concerning the "program for optimal sight" (one to one translation ). They say that if the (inner?)temperature does vary very much from temperatur when turned of the aircon turns itself on. (if you do not understand what I mean I'm happy to quote the original german text)

Arnd

[Holger]

@DirkS

As the whole thread started in german and has been continued in english, can you please rename/extend the title to "Klimaautomatik / Automatic Climate Control" as our non german members surely would like to participate on this as well.

Danke !

[Uwe_rossi]

Originally Posted by Arnd

As Uwe suggested I looked into the manual. I always do what Uwe tells me I didn't find anything that says that after two hours the aircon turns on by itself. What I did find is a remark concerning the "program for optimal sight" (one to one translation ). They say that if the (inner?)temperature does vary very much from temperatur when turned of the aircon turns itself on. (if you do not understand what I mean I'm happy to quote the original german text)

Arnd

I will look where I have seen this. I'm sure because this had made me.