2003 Buick century water pool rear floor boards
 

Hi. Would appreciate help identifying source of water leak in 2003 Buick century. Water seems to collect under the rear passenger - and possibly rear driver - seats and then pool at floor. We cleared the air conditioning hose, seals are good and windows are closing tight. No leaks from windshield so not coming from front.

Any ideas on cause of leak?

possible heater core/rad leaking from under dash, have had a similar event happen to me on a 80s truck

lift carpet and check for hole in floor

Did you find the issue? My son’s 2003 Buick century is wet on the driver floor and the back passenger floor. But not the other two floors. Thank you!