Strange "clonk" inside dashboard
this is my first post in the forum. This is a good place.
I own a 93 400E all service records with 200.000Km. From a few days ago, I am hearing a strange "clonk" inside the dashboard (like a little door closing and opening), is sounds related to the air conditionong system, it seems to change with inside temp change, sounds loudly at first and then low when hot, it has a rithm like 3 seconds between "clonks". Any idea on cause of this. Thanks a lot from Spain.