Mercedes-Benz C220 Questions

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Car had been sitting awaiting new battery which I got.Neighbor said gas was old and something called seafoam was added.Car srove to work fine but after 12hr shift on way home unbearable alarm went off about 10min then stopped
I opened my trunk one day without opening car and now my car only locks using key in trunk. My keys do work to unlock and turn car on, they just won't lock car.
I have cleaned the drain plugs put the best I could but whenever it rains or I go through the car wash the water instead of draining outside the car in drains into the passenger side floor. The whole blower motor and cabin air filter boxes are getting filled with water and I can hear electric shock noises from the blower motor wires. Please help me I already spent 550 dollars on a new blower motor and its not even a year old. Thank you
When I shift car into reverse it doesn't engage trans. I have to go past reverse into neutral first, then back to reverse to engage trans. Samething with Drive. I have to go past drive into 2nd gear then back to drive for it to engage in drive.
I have replaced the blower fan resistor. My reasoning for thinking vacuum or stepper motor is I have no air coming out of any vents regardless of which direction i choose. I accessed the diagnostics of the climate control system and all of my codes relate to flap or valve positions.
speedometer cluster not working
took it to a special shop for diagnosis he made it worse seven codes jumped up he said sorry cant fix your car.He literally threw me out.
had a oil changed in the automatic gear box. reverses ok when cold but as soon as the car is warmed up, it won't reversed when I problem in putting into R gear though.
both of my headlights are out with the low beam both high beams work, I've change both bulbs and they still do not work I even changed the fuse's any answers would be appreciated
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