abbasali31

Hi there,

Not sure if something is wrong with my Auto feature of A/C and Heater. I thought that once you turn the feature on, it automatically adjusts the temperature. Just to check, I increased the temperature on both the driver side and the passenger side all the way up to 80 degrees in a hot condition. I then turned the Auto feature on, but it never went down from 80 degrees to whatever it thought that would be the best.

Am I missing something or do I need to have it checked.

Sorry, new to Merecedes Benz.

Regards,

bob2011

+1

steinjr

My understanding is that Auto means it will automatically adjust the speed of the air and what air vents will be used based on the temperature you set.

MBSebas87

+1 I was never sure how to use the auto function. The manual is kinda confusing too

jonUF02

Set the auto button, set your desired cabin temp on each side, let it work. My wife can't seem to grasp the concept either, always fiddling with the dials. It's just like the thermostat in your house.

reckrab

Okay, maybe I am not understanding your question but the auto function uses the heat / ac and the fan to make the temperature in the car the same as what you set on the display. In your case, the car was hot and you set it to the max high setting so the auto function said "okay, he must want it this hot". Set the temp to 65 in a hot car and you should get the air conditioner to come on full blast until it cools off and gradually scales back. When it reaches 65 it will hold it there. It works the same way in the cold by using the heat to warm it up.

mleskovar

The unit does not read minds. It adjust to the temperature you set it.....in this case 80F. Is this a trick question? Are you blond?

abbasali31

Thank you all for the responses.

The G Man

Its good thing you were not operating the cruise control

SteveE400

I almost spit coffee on another keyboard when I read this one!

KEY08

Really. Dumbest thread ever. Set it to 80 and it won't cool to a temp below that. Well, no Shet!

thefisch

I got laugh out of this thread. Makes me think of all the questions car salespeople must get.

jahquan3

Lmao be nice guys. OP wasn't the only one to not get it, so let's give him a pass on this thread HA HA.

pamiboy

I guess you are. Just set the temp to your preferred setting, push the auto button and forget about it. That's all.

Arrie

Well, I guess the OP gets it, but while at this topic, does someone know what the system does when you set a temperature but it is not on AUTO? Does it just adjust the air temperature to the set point and blow that in the car until changed? Or does it still control to the set point temperature?

jonUF02

It should blow at whatever speed you set the fan, but adjust air temperature to the number set.

And it will also stay on the current vent locations until manually changed to lower vents, higher vents, defrost, combo, etc.

KEY08

Yes, as soon as you touch the FAN button the AUTO feature turns off. The AUTO feature is really adjusting the fan speed to maintain the set point for you.

Arrie

Well, I know it holds the fan speed and vent mode if not on AUTO. My question was if the system still controls the cabin temperature to the set point (closed loop control) or does it just blow air in the set point temperature in the car (open loop control)?

The G Man

Most HVAC system runs open loop in manual mode, no feedback, I would imagine the MB system is no different.

jonUF02

My CLK and Murano run as described above. If you turn the dial for higher blower speed or different vent location, then it disables the auto features that change the speed or vent location, but adjusts the air temp to the set temp. I haven't really tested the new E550 much, but I leave it on 75F auto in FL, and it blows REALLY cold, a strong A/C system for sure.

abbasali31

members with the negative responses: You bunch of morons, I didn't post my question with complete detail as I thought the members with the negative mindset would be smart enough to understand it, but I was wrong.

I set it to 80 degree as an example a few months ago while I was in Arizona where the outside temperature was above 100to to check the auto feature, but the inside temperature never went down to 80 after even 10 minutes.

Instead of bashing my thread, you morons would have asked for the explanation.

KEY08

Yo, your exact words were you set it all the way UP to 80 and the temp never went DOWN FROM 80.
I have never set my temp at 80 degrees, even if it's 100+ outside, so I personally had no idea from your description what your issue was. My Mercedes always cools down on AUTO to pleasant 70 something temp even when it's 100 outside. Your system sounds like it needs a recharge or some other maintenance. These cars have a fantastic cooling system. One of the best.

Arrie

Dear abbasali,


With your post you insult me too.


FU!!!!

abbasali31

Thanks Key08! It was a typo and instead of typing 100, I wrote 80. Ya, It never cooled down so I will have it checked.

Arrie, I apologize and didn't mean to insult you or anyone. Some members were insulting me with their responses so I got ticked off.

mleskovar

Bingo! Give that man a kewpie doll. What that means is it if the fan is on it blows ambient air....whatever the temperature....to vents last positions. And to the OP.....we can only react to what you write. If it's wrong then edit it.