Squeaky-whiny engine

[bozsvari]

Hello,
this is a Kalos with 1.2 engine. After a short time when engine gets a bit warm I get a loud squeaky noise. It seems that the noise is somehow follows the speed. When I swtich off the engine I get a long whiny sound, similar to when gasis released from a pressurized chamber.
Do you have any idea what to check?
Timing belt, water pump, seal rings are replaced.
Thanks.

[Eg.h2o]

The gas release sound is probably from either the brake booster or….most likely the brake booster area.
It is I think a vacuum leak.
the squeaky noise may be from a belt idler pulley. Could be the main belt tensioner pulley or a timing belt idler or tensioner pulley.

[bozsvari]

The gas release sound is probably from either the brake booster or….most likely the brake booster area.
It is I think a vacuum leak.
the squeaky noise may be from a belt idler pulley. Could be the main belt tensioner pulley or a timing belt idler or tensioner pulley.

Thanks, I will check.