What can I do about water getting inside my car when it rain.

Hello, Between the door panel and door, there is a plastic membrane that is sealed to the metal frame of the door. This prevents water intrusion into the vehicle, and is called the weather barrier. It is likely that yours has become degraded and cracked, or the sealant has failed. Removing the door panel to inspect the condition of the barrier will shed some light on the issue.

if your vehicle has a sunroof, make sure the water drains are not clooged. Also make sure the rubber seal around the door is not ripped and the door seat propperly. Hope this helps