Squeaky-whiny engine

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.

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.

Quote:

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Originally Posted by 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.

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Thanks, I will check.