Erwin - I also own a 2008 XC70 that took on water - a LOT of water, 2 inches on the floor after a really good rain storm.
I put duct tape around the sunroof to eliminate the sunroof, I think that the sunroof has 4 drains.
I had a trunk drain problem in our '90 744TI - when I pulled the trunk apart I found that the fitting at the bottom of the hose was smaller than the hose and caused pinch that collected debris, I fabricated a length of stiff, but flexible wire (I think it is high temperature wire with yellow insulation) and marked it at the proper length to fish out the hose. Every few weeks, I poured a cup of water down the drains to prove that they were open, cleaning them when they were not.
At my dealers advice, I had a new windshield insta;;e - no smiles
I should have taped the windshield as well.
A service writer I have known for a long tome took a hose and sprayed it down along the cowl and fender - a ton of crud came out and the leak got to be acceptable - after a good rain, I get a wet stripe on the road when I turn left from my driveway, but no water in the cabin. I hose this area once and a while.
BTW - This car did have a lot of pine needles in various locations when I bought it.
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