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Hi my name is***** only the rear passenger side is getting wet then you may still have a leak from the sunroof. Now if the front passenger floor is wet then you may have a restriction in the a/c drain. Drilling a hole in the floor or removing a drain plug is not advisable as the carpet and it's insulation will mop up most of the water before it can drain. If only the the rear passenger is getting wet I would recommend you seek a body shop in your area. Ask them if they specialize in water leaks. If the front is getting wet you can seek the help of a local garage to clean the a/c drain. It is under the car and you may not be able to reach it on your own. I hope this was helpful.