Astra J 1.7CDTi exclusiv 2010

So I have been letting my issue develop and I still don't hav a clue what the causes are.

No:1, chirping/squeal from engine, does it on idle and now does it when Reving the engine, I'm pretty sure it's not the aux belt because this sounds more at the back of the engine. Once cured by replacing fuel filter but hasn't worked this time.

No:2, engine breathing really hard for no reason what's so ever, has anyone had this problem before? Other minor things that co

Hi all, I have noticed a high pitch chirping on my astra gtc 1.6 turbo, it only happens when the engine is near normal temperature, when I accelerate it's ok, once I slightly ease off the accelerator just a bit I get this chirping noise, nothing on acceleration though.does not happen whilst idling, pressing clutch pedal or brake does not alter the noise.had belt changed but no difference,the mechanic checked everything and he is baffled.the car runs and performs as it should, there are no oil or