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ABC and air-mattic suspension problems, like the one you are experiencing, are common. There are many different causes for these problems. The problem could be caused by anything from a bad shock, leaking line, valve distribution block malfunction, ect.. I recommend having a professional diagnose and repair your issue. In addition, if the suspension does not come up, with the vehicle running, you should have it towed to prevent any further damage.
The transmission control module is located under the dashboard assembly in the center of the vehicle. The easiest way to access it is from the driver's side, where the console meets the floor, just aft of the gas pedal. Although, I recommend having a professional do this because the module will need to be programed to the vehicle.
The engine oil level, on most Mercedes-Benz models, can not be checked by conventional methods. An electronic scan tool is needed to read the oil level in the engine control module. I recommend having it done by a professional with the proper equipment.
A scan tool is needed to reset the abs control module. I recommend having it done by a professional with the proper equipment.
Gas caps on these models will make a clicking sound when properly tightened. This may be deceiving because you will still be able to turn the cap. If the cap does not properly seal it will trigger a check engine light and may need to be replaced.
The conditions you are explaining indicate a fault in your a/c system. I recommend having the vehicle looked at by a professional that is capable of scanning every vehicle system.
To remove the CD changer from the glove box you will have to remove the glove box assembly, lower trim panel, and side trim panel. Some of these parts can be delicate and will need special tools to be properly removed. I recommend having it done by a professional. In addition, the vehicle will need to be connected to a Mercedes-Benz scan tool to electronically remove it from the vehicle. If this is not done other electrical components will not function properly.
The interior of the trunk lid should be fully carpeted. There should be a green trunk release button in the center. Also, the area around the latch will have a plastic cover.
The roof can be operated manually, but I do not recommend anyone but a Mercedes-Benz technician doing it. The procedure very complicated and special tools are needed.
This is actually a common problem after belt replacement. The most likely cause is that the belt is too tight. Check the belt tension with the engine off, there should be some play to it. If it feels very tight, have it adjusted to be a little looser.