wet back seat carpet old Buick, where exactly does it drain from

will it drain by itself = NO.... how can "I" make it drain = use a wet/dry shop vac,vacuum water up... can I lift carpet myself and drain it = NO where do I seal it so it doesn't collect water anymore (show me) = can't show you,we don't know where it's leaking at! you will have to find the leak yourself with a helper. why won't it drain by itself? = there is no drain unless there is a plug in the floor under carpet... I want it stopped; I put groceries there = must find leak and seal it to stop leaking.... Suggest getting in the car,get friend to spray/run water in suspected area where it's leaking to find the leak and then repair it....

Strong vacuum, shop vac or car wash vacuum, then dry with fans, pull dome light fuse or disconnect battery, trunk seal is one possibility, Plus weatherstripping