Join Date: Dec 2007
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wet wet wet
Had exactly the same problem last year (s reg 1.6)
TWIN SUNROOFS NOT THE PROBLEM
The problem is caused by a build up of silt and debris blocking the drainage outlet behind the front wheels (where if you have them, the front mudflaps would be).
Water runs down the windscreen, when this drain becomes blocked the water overflows into the sill and then through
to the floor. The sloshing is the water trapped between the 2 floor levels. Unscrew hexagonal screws holding plastic in place at the back of the wheelarch behind wheel, carefully pull out about an inch and wash/scrape out the gunge.
Any water trapped in the sills can be drained by removing the bungs in sill about 6 inches in front of back wheels. I dried out the car by removing the carpet from the floorbins in the back, stuffing with towels, and driving round, finally using a fan heater for a day.
Hope this helps.