BL5
Posts: 57
Joined: Sun May 03, 2020 10:23 am

A/C Fan Speed issue on Auto

Mon Sep 20, 2021 9:05 am

On my 2017 REx I noticed the following last week.

When driving in Comfort or Eco and A/C in Auto the car starts off a very nice flow of cool air. Typically I’ll have the fan speed set to 2 or 3. After a few mins the volume shuts way back (even though fan speed is 2 or 3) to almost no air volume at all. I can crank fan speed up to max, but still does not blow much more volume of air. When I hit MAC AC, it blows nice and cold.

Anyone have this issue before?
2015 White REx, loaded Tera, ACC
2017 White REx, every option
2018 Tesla P3

alohart
Posts: 2450
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: A/C Fan Speed issue on Auto

Mon Sep 20, 2021 12:32 pm

The i3'a automatic climate control system continues to surprise me after almost 7 years of ownership, so I can't offer any advice that I would be confident about. However, unless you have decoupled the climate control system from Eco mode in iDrive, you will get less intense climate control than you would in Comfort mode.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

BL5
Posts: 57
Joined: Sun May 03, 2020 10:23 am

Re: A/C Fan Speed issue on Auto

Mon Sep 20, 2021 2:05 pm

Art-
Is this decoupling done through coding? I coded a few things with BimmerCode, but this was not one of them. Is there a benefit to decoupling them?

It was working awesome up to a few days ago. Very odd
2015 White REx, loaded Tera, ACC
2017 White REx, every option
2018 Tesla P3

alohart
Posts: 2450
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: A/C Fan Speed issue on Auto

Tue Sep 21, 2021 12:15 am

BL5 wrote:
Mon Sep 20, 2021 2:05 pm
Is this decoupling done through coding? I coded a few things with BimmerCode, but this was not one of them. Is there a benefit to decoupling them?
It's an iDrive setting, at least in pre-LCI U.S. i3's, with no coding required. This setting allows full climate control strength in Eco Pro mode, but not in Eco Pro+.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

BL5
Posts: 57
Joined: Sun May 03, 2020 10:23 am

Re: A/C Fan Speed issue on Auto

Tue Sep 21, 2021 9:41 am

I’m a range wh#re, so I typically drive in ECO+. Although when it’s hot (80 is hot in WA) I’ll use ECO, which is when I noticed this happening. I’ll check my iDrive settings today for that option. Might also test in comfort to see if AC behaves the same way.
2015 White REx, loaded Tera, ACC
2017 White REx, every option
2018 Tesla P3

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