Hi guys,

I've noticed a loud clicking coming from behind the heating controls of my L322 52 3.0diesel.

I believe the clicking is coming from this part, it happens maybe once every 120seconds or so.

Can anyone let me know what this is, or what could cause the loud clicking?

Many thanks

Those look like the stepper motors which control the various mixer flaps which mix hot and cold and direct air to the various vents in the car.

Is it only one of them that clicks loudly? if so, then it may be faulty, or the control system is trying to move it beyond the limit of whichever flap it controls. Try unplugging the connector first as that will at least confirm which one is making the noise.

Following that, if possible, remove it and see what its doing when you switch temperatures or air flow. You should see the spindle in the middle move. Make sure that when you remove it you mark the position of the spindle so that you can put it back in the correct orientation. 2021 D350 Fifty Edition - Carpathian Grey
2017 4.4 SDV8 Autobiography (2021-2024) - Santorini Black
2012 4.4 TDV8 Westminster (2016-2021) - Santorini Black

just pulll it out and replace it. Mine did the same so just purchased one from flee bay and no more noise