today i was cleaning vacuum my carpet and then i find a wet place on co-driver (but i have a LHD car). Does anyone know where from the water came?The picture i borrowed from Rusty 


Or the heater core.
The S2 has what is called a "water box" under the cowl, under the hood/bonnet. It has a drain. The drain can clog and water can build up in there until it crests the edge of the water box, cascading water into the passenger compartment through various openings in the firewall (supposedly sealed but not 100%). In the case of the C4 UrS4/S6 this is a notorious cause of ECU death by drowing. I don't know the exact details for the B4 S2 but I offer this write-up about the C4 water box cowl drain as a guide for your search:


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