V70: General loud sloshing noise in front of dashboard whilst turning

[Morgasmotron]

hello everyone need some help to diagnose to hopefully resolve annoying issue im having on my V70 2009 2.4D estate
for several months im hearing this loud sloshing noise every time I turn or bank sharply round corner
At first I thought it may be bottles of water slung in the boot space rolling round in the back seat wells behind below me ( ive a load of stuff like most in the car ) but i took these away and the noise revealed itself to be sounding to come from the very most front of dashboard area.
now in last couple of months ive noticed an ingress in the heaviest of gales of water on the inside of the screen dripping down the screen to bottom where the air comes out , although not enough to notice a significant misting of the car window in the mornings when you come out to vehicle , like when you know you've got a stone chip hole thats leaking in.
it turns out on examination that my top seal is come away on the windscreen so I think about sealing this up , but on inspection by a local window fitter ex autoglass man he shows me the window is practically totally popped out and talks about getting a replacement as they cant guarantee they wont break screen when taking out to do seals

okay im thinking is this where waters coming in ?
i took off plastic cover over engine bay top that covers the pleniem chamber area is it called ( space that houses wiper motors) and cleared water release holes there i could see and there no visible water sloshing in that space .

i get the front window replaced in the end as Autoglass cheaper as i only pay excess am told its a safety issue so im covered
the Autoglass guy says hes done several of these lately volvo windows popping right out on that year 2009 as they havnt primed the seal area prior to them going through with the initial sealant and sure enough you can see the lack of bond when he removes the window out and how it comes away like its stuck on with pritt stickk ( which was a bit disconcerting as this was a ex paramedic fast response vehicle which would have been in excess of 100 mph regularly . as with autoglass men their totally on the clock for jobs so roadside reinstallation he's not got time to go into thinking where excess water noise is coming from he's just about replacing screen correctly and onto his next appointment booking .

Im left now with a newly sealed new windscreen but still the heavy sloshing sound coming from the front
Anyone have any experience of this issue ? where suppose could the water have got itself too ? apart from sounding like a strapped on fishtank IM totally worried i may be emerging wiring or components in water that no way of evaporating off or rusting stuff i dont need to be rusting
if anyone has any tips or points where they think I should start to rectify this issue id be eternally grateful for the advice