1993 Mercedes-Benz 500SEL Questions

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I have had my Mercedes for over 3 years and i have had few problems in the past with the doors but not like i am now. I have tried almost everything i know to get inside the car, nothin seems to be working. I have also changed the battery a few times. Any feed back will be helpful
I'm thinking I can stick 2 flat objects in little slots on bottom of radio and it would come an american car...but Idk and would like some help so I don't mess nothin up. Thanks
I have taking the car to different mechanics and they cannot find the issue. My car starts but when I drive it say an hour and gets hot, and turn it off, it will not start. I have to let it cool off to get back home. lol
The third brake light works but not the left/right lower brake lights
car is running heat on and when i try to direct it to center vents it wont blow out blower fan is working does okay if i push the ac or blue button by vents but only operates on ac only all push buttons seem okay
Car has a hard bounce in the rear. Feels like a lowrider at times.
A new battery has been installed and I cannot lock or unlock the car. Is their a relay that might be burnt, or a fuse.Also the heated seats are coming on and we cannot get them to go off..Help!
time they work but most of the time not.
air condition works great, when the hot car is parked shortly, I get heat in 2 side air registers mixing with the cold air. when it happens I shut down the 2 registers and divert the cold air to the center registers by switching on the extra air blower.
The back seat air condition duct delivers cold air all the time, no problem there. I live in Florida, do not have to heat the car it is hot enough, that is the reason I want to bypass all the hot water that goes to the cabin. HELP
Where do I look on the engine to add antifreeze?
I want to know the best way with least resistance and the least amount of damage to the car
if it was an old rear wheel drive american car it would proably be the universal joint, what could it be in this car, the stomp in coming around front seat center i think. This is a knocking sound.
How do I turn the volume down on the radar detector?
When i start the car when its cold it starts great , after it gets warm its hard to start are won't start at all, I also have some transmission problems, could the two items be connected?
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