Mattj9166

Hi everyone. New here. Having this ticking/knocking sound from behind the dash on my mark 3 Octavia. it’s fairly central but unsure what it is. I’ve taken the glovebox out and taken the blower motor and the flap motor out and it still makes a knocking sound when I change the direction of the blowers. I’m not sure what the part is called but it’s the part that the flap motor screws on to? If I put my fingers on it I can feel the knocking coming from that. I’m unsure what it’s called or how to even get to it without pulling the dash apart. Any kind of help here is appreciated!