2000 Hyunadi Sonata has water in the trunk

Hey Grady..
There are few things that could cause the water intrusion... Is the carpet in the front floorboard wet?.. ..Has it rained recently? This will rule out window seals leaking? Have you opened the trunk and checked to see if water is in the trunk? OK..IF it has not rained, no water in the trunk, AND the front floorboards are wet, then the heater core is leaking...
Do It Yourself and DIY Auto Repair by ChiltonDIY
Free Automotive User Manuals ManualsOnline com
https://haynes.com/en-us/search?query=2000%20Ford%20Crown%20Victoria

Grady.. sounds like its either the window seals or the door seals.. check for damaged door seals, cracked window seals..

Water leak in trunk may be coming from the vent flaps located behind bumper cover if they stick open water will inter truck while driving in rain if not that you may need to replacle. Rubber seal around trunk

I am assuming the water comes in when it rains.
Could be the trunk gasket or the tail light.
You may need a body shop to find the leak.

When diagnosing a water leak, here's a handy tip. Check the accumulated water. If the water is dirty, look for leaks from the underside of the vehicle (floor, wheelwells, etc). If the accumulated water is clean, look for leaks from the topside of the vehicle (trunk seal, window seal, etc). To find where the water is coming from, shut yourself in the trunk with a flashlight and have an assistant run water over the trunk with a garden hose. You may have to remove some of the interior trunk trim to see exactly were the water is coming from, but chances are you'll find it. Also another common cause of water leaks are from impact damage, so check for collision damage repair. while your in there. -hope this helps.

could be the drains but most likely from spoiler leaking past the seals or wheel wells rusted out or caulk from seams is it when you wash car or rain it rains check it out use a garden hose for water test

your rearwindow seal is mabey the culpret.you can get them re sealed pretty cheap.(worked on my cavilier)

Mother nature is too slow in finding leaks. Have someone small get in the trunk with a flashligh and watch as you run a hose over everything. LET THE PERSON OUT!

This may sound odd but if you can put a small person in the trunk with a flashlight while you pour water in the areas suspected, they can trace the leaking area, believe it or not I used to use this method while I was a Ford mechanic. Otherwise, maybe you can apply clear or black silicone to the area or remove the screw or bolt and coat it with silicone and replace it.

whats your weather stripping look like? dry rot? smashed down? toren? or may be comming thru back window? hole in trunk? thats all i can think of. happy hunting.