It seems when the air is damp my car won't start. My husband's car boosts my battery and the car starts. I took the car to Mercedes Dealership in West Edmonton. They suggested a new battery so $525.00 later a new battery 3 weeks later still won't start. The one motor under the driver's seat was sticking so that was replaced. Then it started fine for about a month. Now it's doing it again. I bought this car used. An after market stereo system was installed with DVD screens in the headrests. I'm sure that there is a short somewhere after the install, but it's so weird that it works for so long and then out of the blue it won't start. I love my to drive this car - its fun. I need to get a fix! Help!