Sucking noise from air vents

[Barnzey]

HI guys
I have noticed a strange sucking noise coming from the centre air vents when car is running and for about 15 seconds after it is turned off then it is quiet
I have tried it with air con on and off but no differance it still there
Does any one know what may be corsing this
Thanks

[Rusty]

u havent invested in a beachball sized pod filter lately?

[Barnzey]

No standard air box with stardard filter had a serive done on it a week ago

[The1]

vacumme leak on the selectors, is it climate control or standard?

[Barnzey]

vacumme leak on the selectors, is it climate control or standard?

Hi
The car is a bog stock standard V6 VS ute series 2
Where would I look to find this problem
Thanks

[The1]

The selector switch which controls vent directions, it has a vacumme module on the back which might be causing the hissing noise.

[hako]

It's possible the vacuum line is split/missing where it goes thru the bulkhead - this will make a hissing noise whilst the car is running and also for a while after shutdown until the vacuum reservoir is exhausted. Check the hoses.