Friends ...... I own Fiat Linea (Diesel Multijet 1.3).
I noticed strange rattling noise (not loud), when I turn on AC.
Recently I noticed that the coolant got empty in my car, and later I sent it to service station and they said the radiator had a small whole due to which the coolant got empty. They have fixed it and loaded the coolant. Since then I noticed this noise. Please advice me for further.

Air con needs recharging me thinks
Luigi

when you refill the refrigerant you need to also refill the system with oil, if they've not done this then there is a good chance the compressor is running without oil and has resulted in damage.

Hi, I have such a problem, but service told that everything is ok, I asked another guys in our Ukrainian forum, some of them who owns linea m-jet got the same as me and you - when a/c is turned on strange sound flows from the hood now I'm watching it but nothing happens, so maybe this is design feature for that type of engine?
I own Linea 1.3 m-jet (90ps) 2012 year make