Scattered disc + strange noise in the engine compartment

Hey guys, about 3 -4 weeks ago I had my interior mirror glued back to me in the Opel workshop because this one just hung down in the morning. The in the workshop hams also only on the 2nd start made the part to cardboard because it is a bit heavy and clunky (automatically dimmes the light, doesn’t know what the technical term for it is). Yesterday evening my father comes home and thinks I should look the mirror is off again and the disc over I thought he was joking because the chin was stupid when I had the car relatively new and it was in the workshop because of such stupidity. So below you see the pictures I thought I was crazy! So I went off into the thick ship and to the workshop. Of course calmly and objectively asks for the boss, who already came to meet me and said tell jetz not your mirror is off again… .. the thing looked at was astonished that something goes on. He explained this to me can be due to the temperature fluctuations, or to the 2 phase glue they used. Well, on the question of what we wanted to do the jetz he turned me on we do about Teilkasko and the workshop takes over the excess…. I don’t have a partkasko he means no problem he knows the insurance agent with whom I am. Which means I would pay more money in insurance and he gets away cheaply. My question is now if he is obliged to reimburse me a new disc + the mirror, or that again in order to brin point 2 is when the engine is cold one hears a strange noise quite loud I don’t know it would call a buffing sound n a bit like if someone is sitting on a Harley and gives a little bit of gas in idle. As soon as the engine is warm the noise is hardly audible anymore. Unfortunately, up to now, it didn’t have the possibility/time to look at it. Tap hole in the cracker or a slightly open bell or something. If anyone has an idea or it knows or tell me anyway I can look at what I should pay special attention to when I look at it while I am very connected:P. A lot of text by little I know ^^ Thank you for your help and because of my sought-after summer tires have atm (235 45R17) Winter tires I look at it in the threads like this or if someone has a tip for my ship gladly by message to me Thank you for your help the new Omi driver Andy