My 06 Elantra with 35k miles hasdampness in thepassenger floorboard area. I have checked the air conditioner condensation line and it's flowing normally. Lifted up the carpet and dried out underneath but the moisture returns. It does not have the sweet taste of coolant so I doubt its the heater core. Any ideas? Thanks.

 

It's an 06? Take it to the dealer. Full warranty still applies, even if you're not the original owner. I think it might be a bad windshield seal.