Engine whistle noise?

[evox2]

i have a problem with my car during every morning. when engine start really cold, there is like sort of whistling noise for less than a minute after that no more sound. It only happen only cold engine. weird, any idea?

 

[infinityKL]

belting
ac tensioner
pressure regulator

 

[evox2]

belting
ac tensioner
pressure regulator

oic, thanks. today i hear property, seem coming out at the belt or alternator there. but it disappear less than a minute.

 

[kshapawi]

ac tensioner or maybe belting...maybe also your alternator...I had mine same issue..just ignore...and somehow...the alternator kaput...error come out shown picture of batery....maybe the carbon already gone...