[tomtom11]

quick question, the auto button on the e90 climate control changes the fan speed, but does it also automatically change which vents the air comes out of, or is that still manual?

[GB-335xiCoupe]

Ejection seat. Automatically ejects ugly chicks out the sunroof.


Actually, it seems to balance the airflow between all three vent locations.

[maxgohan]

I would guess it controls all aspects of the hvac to ensure the temp has reached the specified degree

[tomtom11]

So it seemed like a dumb question, but nobody seems to actually be sure?

[norsairius]

Originally Posted by maxgohan

I would guess it controls all aspects of the hvac to ensure the temp has reached the specified degree

This is my assumption as well.

[krahooligan]

its climate control. if you set it at 60 its gonna get your car down to 60 and keep it there.
think of it as a thermostat.

[335m]

Subbed for the rare occasion that someone replies with actual knowledge of the system not just an opinion.

[norsairius]

Took a couple minutes to find it in the PDF manual, offered online via BMW

[nynyny]

Originally Posted by norsairius

Took a couple minutes to find it in the PDF manual, offered online via BMW

That's one thing I've never understood... so even if you have the heat on, the cooling function should remain on as well? I think it's covered in the manual but I still don't get it.

[AndreyT]

Originally Posted by maxgohan

I would guess it controls all aspects of the hvac to ensure the temp has reached the specified degree

Not really. Automatic mode canot enable/disable the AC (the snowflake button). Enabling/disabling the AC is always manual. If the AC is disabled (the snowflake light is off), the CC system will never be able to use AC.

"Auto" mode basically stands for "automatic fan speed and stratification control". The temperature is set manually and AC is enabled/disabled manually.

Originally Posted by tomtom11

the auto button on the e90 climate control changes the fan speed, but does it also automatically change which vents the air comes out of, or is that still manual?

Yes, of course it controls the vents as well. I don't know why you'd assume it was "still manual", since any attempt to switch the vents manually immediately disables "auto" mode. The reverse is also true: if you manually turn off all manual vent control settings (by pressing each activated vent button again), "auto" mode will activate by itself.

[thomas88162]

Originally Posted by nynyny

That's one thing I've never understood... so even if you have the heat on, the cooling function should remain on as well? I think it's covered in the manual but I still don't get it.

It just means that the A/C is on. The A/C not only provides provisions for cooling the incoming air, but it also dehumidifies it. This makes the cabin more pleasant and it keeps the windows from frosting/fogging up.

[AndreyT]

Originally Posted by nynyny

so even if you have the heat on, the cooling function should remain on as well? I think it's covered in the manual but I still don't get it.

The AC unit is not just for cooling. It is there for dehumidification as well.

In fact, some might claim that the primary purpose of AC unit is dehumidification. Historucally, the compressor-based AC unit were originally invented specifically to perfrom dehumidification. The cooling was just a side-effect of the process.

[kfriceman]

That is why it is called Air Conditioning and the previous post is wrong, when your turn on the automatic function it also turns on the AC function at the same time.

-Kevin

[AndreyT]

Originally Posted by kfriceman

That is why it is called Air Conditioning and the previous post is wrong, when your turn on the automatic function it also turns on the AC function at the same time.

That is misguided. Yes, when you press the "Auto" button directly, it also enables the AC. But that just two coupled buttons, nothing more than that.

Firstly, you can manually disable the AC afterwards. The "Auto" mode will stay engaged, but AC will be disabled. It will not enable by itself.

Secondly, you don't have to press "Auto" button to engage "Auto" mode. You can simply hit each of the three vent buttons that have green light on it. Once all vent lights are off, the CC will automatically enter "Auto" mode. However, the AC does not enable itself when you enter "Auto" mode through this path.

The bottom line here is very simple: enabling/disabling AC in E9x always requires a manual button hit. It could be different buttons, but a manual button hit is always required.

[Miller335]

I dunno, I'm strange as I've never used it before.

I guess I'm a control freak. Explains why I bought a manual also.

[PTinVT]

I've never used it, never even considered it. I figured if it's half as good as the automatic wipers, it would turn my cabin into a menopause simulator.

[kfriceman]

Originally Posted by AndreyT

The bottom line here is very simple: enabling/disabling AC in E9x always requires a manual button hit. It could be different buttons, but a manual button hit is always required.

This is completely false, when the auto button is turned on by system default the AC compressor is also engaged, the green light for the AC button lights up. Yes, you can then manually operate the AC thereafter.

-Kevin

[AndreyT]

Originally Posted by kfriceman

This is completely false, when the auto button is turned on by system default the AC compressor is also engaged, the green light for the AC button lights up.

What is "turned on by system default" supposed to mean? When the car rolls out from the assembly line in Germany and gets turned on for the very first time? Or when you do a full reset through OBD port? Or when you disconnect and reconnect the battery?

How do you set it to "system default"?

[kfriceman]

Originally Posted by AndreyT

What is "turned on by system default" supposed to mean? When the car rolls out from the assembly line in Germany and gets turned on for the very first time? Or when you do a full reset through OBD port? Or when you disconnect and reconnect the battery?

How do you set it to "system default"?

I can't write this any simpler, if the HVAC system is off and you turn it on by using the auto button it also by default turns on the AC function. It is the way the "logic" of the system was designed.

-Kevin

[AndreyT]

Originally Posted by kfriceman

I can't write this any simpler, if the HVAC system is off and you turn it on by using the auto button it also by default turns on the AC function.

There must be some reading & comprehension issue involved here.

Let's me quote again what I said in my previous post

Originally Posted by AndreyT

The bottom line here is very simple: enabling/disabling AC in E9x always requires a manual button hit. It could be different buttons, but a manual button hit is always required.

To which you responded

Originally Posted by kfriceman

you turn it on by using the auto button it also by default turns on the AC function.

I said that turning on AC requires hitting some button. You post that hitting auto button will turn on AC.

How is your post supposed to refute mine? And if it isn't, then why are you accompanying your posts with "this is completely false" remarks directed at my posts?

If you want to prove me wrong you will have to show how to enable/disable AC without hitting any buttons. Any buttons. Do you know how to do that? If not, then I can only repeat what I said above: enabling/disabling AC in E9x always requires a manual action - a button hit.

[deeLow]

Auto a/c can be coded to NOT turn on by default. Thus hitting "Auto" only turns the fans and vents on.

I couldn't stand having to manually shut off the a/c just because I wanted auto climate

[tomtom11]

Ok so setting it to auto will adjust the fan speed and which vents are being used, but if your not using auto and you don't click on any of the three zones, how does it decide which vents the air comes out of?