My A/C has just also died overnight within the last two weeks and after speaking to a family member who is a mechanic i was told that it most likely just needs to be regassed. As its coming into winter in Australia im just waiting till the car needs servicing. But i was advised to not use the A/C when its low on gas as it may damage the compressor.
The W202 body has a problem with the ac system. The front condinser is not protected from road debris. I took a small rock in the front and I lost all my freeon. The part was $550. It was easy to replace but time consuming. Take a look at your front end and see if you have had the same happen to you.
I had to replace my A/C Compressor because the clutch burned out. I picked up a refurbished compressor and a new dryer for $500 + $50 core for the old stuff, also most cars require freon gas, most the Mercedes need liquid freon.
Waited for a service to get it checked out. The compressor is bad and mercedes suggested replacing the dryer at the same time. Total cost = $1600. I think I will shop around, maybe find something online.