The drains are in the wheel wells. You have to remove the plastic panel in the wheel well. Pour some water in the sunroof drain area you'll see it come out a little rubber nipple. Take a razor and cut off a little of the end of the nipple so water flows easily out. They are closed and the water pressure isn't enough to open fully and the water backs up and leaks inside.
Check your water drain holes. There should be one in each corner. The older Saturns would get blocked and the water would back up. On those you can access the drain tube on either front side at the kick panel. I've not tried to fix an ION so I'm not sure how the drains work. Open the sun roof and pour a little water in each corner. The water should drain out behind the front wheels and somewhere near the rear. If it doesn't you have blockage. Find the drain tube and run a wire through it. Make sure your are careful because you can pierce the rubber tube. Good luck.
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