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Well, i have a 1988 model 740, what you've gotta do is rip up the carpet and underlay from atleast one side of the car in the front, now, near the wheel well there is a black plastic curved square, this piece of plastic must be the stupidest thing i have ever seen volvo do. This plastic is usually sealed on with windscreen type gooee stuff. When the water runs through the gap in the cowling and flows down the inbetween the guards and the interior metal, this piece of plastic is what stops it from coming into the car. I only know this through, unfortunately, experience of getting into my car one morning and having nearly 3 cm deep water in my passenger side!!!! You wouldn't believe how much water those plastic things leak. best way to seal them up, is get some black silastic goo, and use lots of it...........The previous owner of my car thought that blutak was a suitable sealing compound......believe me, it isn't.
When you run a hose, point it down the windscreen, and leave it for 5 minutes, come back, and my guess is thats where the water in comming in from.........
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