they will tell u its norm....
hihi, indeed they told me is norm... but i still insist them to do a check on the squeaking instead of the hissing..
when i collect my car, the report said "TESTED OK" means nothing's wrong..
i told the other service advisor again and he immediately send to the workshop again to tighten the belt.. after which.. i shld say the squeaking sound is gone but still gotta live with the hissing sound cos it's the sound coming from the compressor when it pump the coolant gas out.
Conclusion - hissing sound shld be norm but not squeaking.

btw any bro here has totally no sound from the compressor?? pls share... thks!