Have a 1999 volvo s70 that is starting to let water in somehow. about two weeks ago i started messing with the floor mats and felt water underneath all four mats. now it had been dry outside that week. i was thinking maybe the heater core but i dont seem to be having the foggy inside and the water seems clear and slime free. i do not have a sunroof in my car. the next few days have been sunny and the floors dried. today it rained and now my car is wet on the floors again. anyone think they know what could be happening? or where the leak could be coming from. i live in nyc and the roads here are terrible in brooklyn. maybe ive torn something open?

 

Check coolant level. No other internal water source. Never seen AC condensation flood a floorboard.

 

Sounds to me like you have a window leak somewhere, maybe your windshield cow has blocked drains and the water is coming in the cabin filter area. Make sure all the drains are clear, motor area and trunk area.