just had new tensioner pulley and fan belt fitted to volvo s40 , 1999 . Within a few miles after collection ,i noticed a sloshing sound coming from around gearbox area. Looked underneath car as well as under bonnet . Coolant level and engine oil normal . Car is dry ,no spills etc . Any ideas ? could this be linked to new tensioner pulley, or just coincidence ?

Just sounds like water, oil, fluid etc escaping