No air flow from floor vents

[Adorian]

Hello,

I have a x5 e53 2002 184 hp 3.0 D and i have an issue with air directions, if I select up (windshield ) air will blow on front vents ( center ) and if i chose floor vents no air at all and if i chose all 3 positions up center down, it blow a little bit on floor and rear vents. Could you please give me an idea what should i check ?

Thanks

[wpoll]

Originally Posted by Adorian

Hello,

I have a x5 e53 2002 184 hp 3.0 D and i have an issue with air directions, if I select up (windshield ) air will blow on front vents ( center ) and if i chose floor vents no air at all and if i chose all 3 positions up center down, it blow a little bit on floor and rear vents. Could you please give me an idea what should i check ?

Thanks

Do have automatic climate control or the three manual dials?

Either way, the air is directed/controlled by flap valves in the ducting. These flaps are usually moved via motors and Bowden cables, so there's a few possible failure points there...

[Adorian]

Originally Posted by wpoll

Do have automatic climate control or the three manual dials?

Either way, the air is directed/controlled by flap valves in the ducting. These flaps are usually moved via motors and Bowden cables, so there's a few possible failure points there...

I have automatic climate control. Is it hard to replace the motors ? or the flaps ?

[wpoll]

Originally Posted by Adorian

I have automatic climate control. Is it hard to replace the motors ? or the flaps ?

Here's the TIS page on the HVAC systems...

https://www.newtis.info/tisv2/a/en/e...ater-controls/

And the specific page for the foot well flap motor...

https://www.newtis.info/tisv2/a/en/e...ntrols/OMgUSKe

Maybe check the foot well flap motor is running?

[Qsilver7]

Originally Posted by Adorian

Hello,

I have a x5 e53 2002 184 hp 3.0 D and i have an issue with air directions, if I select up (windshield ) air will blow on front vents ( center ) and if i chose floor vents no air at all and if i chose all 3 positions up center down, it blow a little bit on floor and rear vents. Could you please give me an idea what should i check ?

Thanks

Since we know that you have the IHKA (auto) climate control system...this almost sounds like someone has done work on the HVAC system and moved some of the stepper motors (aka flap actuators or servo drives).

Each flap actuator has a specific operation...and they can't be moved to other positions. If they do...then what you explained usually happens. If you put the defrost vent stepper motor (actuator) where the face vent stepper motor goes...then when the IHKA control panel sends the command for the defrost vent to open...the face vent stepper motor will respond because each stepper motor responds to its specific command regardless of where you've installed it. Install it in the wrong place, then the wrong flap will open.

Could this have happened? Has work been done on the HVAC system where the stepper motor/actuators could have been removed, then replaced in the wrong position?


Here's some info from the TIS website that explains the aforementioned specificity of each stepper motor: https://www.newtis.info/tisv2/a/en/e...-motor/XBgyciJ

Servodrives

5 electric servodrives and 1 high-speed motor are fitted in the system for infinitely variable actuation of the air-outlet flaps for the IHKA. They consist of stepper motors and step-down gear systems.

A stepper motor with 4-pin connection driven at 500 Hz operates the fresh air/recirculated air flaps. Bus-controlled motors are used to operate all other flaps. Each of these motors features its own electronic circuitry and is electrically coded, i.e. the motor must be installed in its intended position.

The design of several components in the electronic circuitry of the motors has made it possible to reduce the size of the control electronics to such an extent that it can be housed in the operating unit. An additional control unit is therefore no longer necessary.

A further advantage is that up to 5 motors can be connected to a common 3-core branch. Two motor variants are used with the connectors on the electronic section brought out to the left or right.