2011 Buick Regal - Leaks

When it rains there is water in the car. I usually here the swishing of water at the back panels of the car as i am coming to a stop. I usually let the water drain from the holes at the back doors. Just can’t figure out where the water is getting thru. It has already burned out the computer in the back of the trunk twice because of water now getting in the trunk. Does anyone have any idea of how this is happening? Please advice thanks.

Check back window trunk and tail light seal’s.

Is water still getting into the rear doors? They will never seal completely; that’s why they have drain holes. You may have to remove the door panels to clear out any debris that is blocking the holes.