Mercedes-Benz S430 Questions

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To release tention fo take beld off for alternator replacement
i noticed the car was low in the back when it sat. not big deal, fills up when i run. the car used to "hiss" when i would shut the door, now it doesnt. when i was detiailing it with aggressive power washer to underside, i came out the next morning and battery dead. charged it and sat in car when i turned it off. something in the radio area kept running for 5 minutes and then turned off. the power lock to the doors wont go down into the locked position. when i manually lock then press unlock on the for it takes 2 times for them to rise. trunk wont open either at the door switch, the fob or the latch at trunk...
All 4 struts and pump have been replaced car still drops over night, worse when it is cold! What can be done to solve this problem??
The engine starts ok but is very hard to steer.
I can here pressure release when car if cut off...also hear a rumbling sound
I I noticed all the recalls that were on my car in the year 2006. I am having the same problems can I take my car to the dealer to get fixed? Or is it too late?
I bought a 2002 Mercedes s430 off of a guy on Craigslist a couple months ago. I know nothing about cars and there mechanics under the hood and little else wear but I was impressed by the cars smooth drive and everything seemed to be great. A week after having it and letting my boyfriend drive it all week long, the car somehow won't gear shift anymore. It stays in w mode which I think means winter. Which I usually just say that it's stick in second gear when I explain the problem to people, I'm not sure if it's actually the 'second' gear. Anyhow, when this happened the check engine light came on and it's been about two months, I haven't gotten it fixed yet and so obviously the check engine light has never left. When I drive it I try to drive it only on streets, not freeway. Cause I can hear it making noise as if it's over exerting itself when I get to a higher mph and it nears the red zone of my rpms quickly around 50mph our higher. Then a couple of weeks ago I got a malfunction message on my dash telling me to check my coolant. So I bought coolant and before I knew it the dash was telling me to stop the car. So I pulled over had two guys help me. When they put the coolant in they informed me that one of the little hoses that goes into the container that holds all the coolant is broken. It was barely attached on one side and showed me the sprays that you could see inside my hood from that coolant hose. So I still haven't gotten it fixed because for one I know it's gonna be a lotof money since it's Mercedes and because I can't find a proper time to take it in cause I need to make a day that I can actually go without it. Its important ib fix it though. But anyhow last night the coolant message came on my dash again and so when looking under the hood, I noticed that the hose completely broke off. My boyfriend super glued it. Can anyone tell me if all these issues are from one problem or is the gear stuck and engine light and coolant sperate issues. How do I identify what the repair/problem is so that I can do an estimate on this website for the cost of the repair. I don't even know how the problem is identified.
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