Quote:
Originally Posted by JCL
...There is another subtlety that isn't addressed. ... as I recall it also had a type of semi-automatic mode, in that you could let the system decide the ratio of top vent/bottom vent and you set the fan speed, or you can adjust the vent mixing and let the system choose the fan speed.
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I understand what you're referring to...and the e46 forum member didn't mention it in his write up...though he did a very good job in explaining what some BMW owners seem to find confusing.
I'm not sure though, if the AUTO air speed remains on if you change the air direction button from AUTO to windshield/dash/floor...I'll have to play with that on the way home if I remember.
{ EDIT: it took me so long to get this together...looks like racingbmwm3 answered this one.
}
There are 2 AUTO programmings if you have the IHKA control panel...
- air direction - you have the defrost/dash/floor vents...AUTO will send air through the vents based on its own algorithm...but the driver can make a manual selection of windshield (defrost)/dash/floor...and the passenger (in the e38) can select the dash or floor.
- fan speed - when in AUTO mode...the word AUTO will appear in the fan speed display...if the fan speed button is pressed, the system will go into manual fan speed mode based on how many dashes "- - - -" appear in the display...to return to AUTO fan speed mode...press the AUTO button on the IHKA until you see AUTO appear in the fan speed display again.
This topic is covered also in the owners manual on the page below (just an FYI for those that forgot or didn't know.
The other thing that wasn't covered were the IHKA's pre-programmed settings MAX/REST/Rapid-DeIce-DeFrost. The latter (rapid defrost) confuses many BMW owners across mutilple models...they wonder why they can only get high heat at high fan speed velocity when they want to defrost/de-ice the windows...not knowing that the button they keep pressing is for RAPID DEFRSOTING...and if they want to control the air temp and speed, all they need to do is press the WINDSHIELD (upper button) on the IHKA control panel to send air directly to the windshield.
Those with the MAX button on their IHKA control panel have a preprogrammed cooling mode when temps are above 61 degrees (F)...and a warm mode (REST) when temps are BELOW 59 degrees (F). Those with a REST button only ... only have the warming mode :
The AUC system (as mentioned by the e46 thread) is the auto recirculation mode. You can get fresh air all the time, recirculated air all the time (not good for you), or an auto recirculation mode that utilizes the AUC sensor up near the radiator: