[Erie Von Otto]

Anyone have a drawing of how the vents and valves are laid out in the F30 dash?

When go to defrost, I hear a valve moving and then there is a whistling sound and no air coming out. If I cycle it a few times it may work, but that's about a 20% success rate. Otherwise, as I start driving down the road, it eventually pops open and the defroster works.

Trying to find out where the valves are and if maybe anyone else has dealt with this. Searching the forums and Google-Fu have been weak for me on this.

Really would like some help.

Thanks.

[4x4kiwi]

Not sure if this is what you are after

1 Actuator drive, blending flap, left
2 Actuator drive, ventilation flap, left
3 Actuator drive, air mixing flap, left
4 Actuator drive, rear compartment flap
5 Actuator drive, air mixing flap, right
6 Actuator drive, defroster flap
7 Actuator drive, ventilation flap, right
8 Actuator drive, fresh air/recirculated air flap
9 Actuator drive, blending flap, right

David

[Revoltos]

Originally Posted by 4x4kiwi

Not sure if this is what you are after

1 Actuator drive, blending flap, left
2 Actuator drive, ventilation flap, left
3 Actuator drive, air mixing flap, left
4 Actuator drive, rear compartment flap
5 Actuator drive, air mixing flap, right
6 Actuator drive, defroster flap
7 Actuator drive, ventilation flap, right
8 Actuator drive, fresh air/recirculated air flap
9 Actuator drive, blending flap, right

David

When I have carried out a diagnostic through ISTA on my IHKA unit, it states the "air distribution flap motor has failed to reach 0 degrees. When I look at schematics of the unit, none of the flaps are referred to as "air distribution flap". Does anyone have a clue as to what flap ISTA is talking about?

[Erie Von Otto]

Sparking this back up as I haven't been able to find a solution yet. The vent appears to stick at some point and not fully close to allow the exchange to blow air up through the defrost. I have attached two videos that you can hear as I press the defrost and then auto button.

Anyone have any ideas? When I had the glove box out, I could see the valve moving up and down. Not sure how much it is supposed to go but it looked like it was doing the full run.

Any hell would be great.

https://youtu.be/U6hxZOGfsBs

https://youtu.be/C36uN-aEVP0

[Revoltos]

Number 6 actuator could be the one at fault here. They are all the same part No. IIRC, if you can take one off and swap it with the defroster actuator, it might determine if that flap is operating correctly. ISTA does have a diagnostic mode in which you can operate each flap, it will tell you what angle the flap is at and if it has reached its required position. It's probably worth doing that before destroying your hands trying to get these things out.

[Erie Von Otto]

Originally Posted by Revoltos

Number 6 actuator could be the one at fault here. They are all the same part No. IIRC, if you can take one off and swap it with the defroster actuator, it might determine if that flap is operating correctly. ISTA does have a diagnostic mode in which you can operate each flap, it will tell you what angle the flap is at and if it has reached its required position. It's probably worth doing that before destroying your hands trying to get these things out.

How do you get to the diagnostic mode in ista? Do you have a link to the process or manual or anything I can use by chance? Thank you!!

[Revoltos]

Its within the IHKA ECU functions which you access from the cars ECU tree.

[ThatOne340i]

I started having this same issue and have not been able to figure it out, ive tried to recalibrate the valves and everything through ISTA/ESYS but no luck, have you figured out a solution? 2016 340i

[Erie Von Otto]

Originally Posted by ThatOne340i

I started having this same issue and have not been able to figure it out, ive tried to recalibrate the valves and everything through ISTA/ESYS but no luck, have you figured out a solution? 2016 340i

No luck yet. Bought a small dash heater from Advanced Auto until I can get it sorted.

Hoping someone can let me know how to access the vents without disassembling the dash. Glove box and/or digital display? I need to get this figured out ASAP...