I hear sloshing, like water, around the dashboard area, when driving, turning.

I own a 2010 ML350 and for the past few years there have been some kind of swooshing water noises when making a turn. I took it to the dealer and now they are telling me that due to a seam being damage and the cost of fixing it is about 1600 due to the 12 hours of labor when the seam is about 120.00 for the parts. This seam is located behind the dash board of the car and the water was sitting/seeping in.

You're low on coolant.

possible A/C condensate drain tube is clogged up.any water in the floor boards?

My 2006 also has a water sound in the dash I donty know what is causing it, and no one else does also ABS ans ESP and Brake light on had 4 magnets and Module changed and is still coming on . After the ER brake is put on and it wont up shift into R I have to put in D or N then it will go into R . the Odometer went nuts too and i was pressing on Gas and it was spinning out of control scarey could of went 100 miles an hr out of control I was scared and the car was stuck so i turned it off and restarted and it was fine this car is spooked it going in shop on MOnday also there is a bird squeek under hood at Idle.. I just spent 1800 and its not fixed I bought pre owned and the seller paid the repairs b