I have been having leaks as well to the point where the water destroyed the drivers side fuse box. In may case the water gets in the sun roof. The sun roof drain runs down the column supporting the windshield but it cannot handle high volumes of water so it backs up and overflows into the car. Becase the roof is sloped forward the water leaks into the fornt and runs down through the fuse box and under the driver and passenger doors.The GM dealership could not find the leak so I took it to a body shop who found it quickly but a are having trouble finding a way tp stop the leak through the sun roof.
Anyone else having this problem?