Mercedes-Benz S430 Questions

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I havent drove my car in 2 days and when I went to drive it last night just as i pulled out AIRMATIC TOO LOW warning appeared. I pulled over and saw that my car was sitting in its tires. i turned around and parked it. This morning I go out to check things out when i opened my door I could hear the pump as if it were trying to raise the car, however the car did not move at all. I opened the hood and something shot out litterally when the pump turned off. it seems like a a black rubber circle a little larger than a quarter. I guess what i am wondering is... if the pump is running does that eliminate the possibility that the pump is bad or they relay? i cant drive the car and im single and in college, making 10 an hour in a mortuary... if possible I want to fix it myself.
LED Temp Gage "Outdoors" no longer lights up. Also the display panel / computer shows right side passenger headlight "not working," but it DOES!
I replaced the leaking a/c line, but the air only cools on the right passenger side. Replaced my control unit, it's still doing same thing. It wouldn't even cool at all until I erased diagnostic codes v1256, v1257 and v1269 but it wont let me erase code A1056.
How to Diagnose and Repair it? Also a good website that is free on how to diagnose and repair vehicles yourself?
Been having trouble with the right front side. Replaced the air shock twice and now that side wont raise. The compressor does come on for a lil while then turn off. It seems like there's a leak somewhere in the system but can't find it. But every once in a while that same side will drop down for a lil bit. Then I would have to turn the car off a few times for it to finally air up.
The previous owner said that his mechanics told him the ESP BAS ABS module is bad and it make the cars suspension, automatic ride shocks go up when the turn when I turn off the car. Is this an easy fix or is it something it's much more difficult than just replacing that ESP BAS module to control the airmatic shocks. I'm try to decide to purchase this vehicle or not need help bad!!! My first time buying a Mercedes Benz just don't want to throw my self down a money pit.
the temp keep going up an fan will not come on
Trunk lock will not stay in closed position. I can hear the latch lock but it immediately releases and unlocks the trunk.
plus the back seat head rest wont go down using the automatic button and automatic door locks dont work. Is this a fuse problwm?
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