LOL... I had to do the same thing 2 weeks ago with my AC Jim. A couple weeks before that I tried to make an apt at the Mercedes dealership, but couldn't get in for 2-3 weeks, so I ended up taking it to a local shop. They added Freon and made sure there was no leak in any of the valves/covers, but that didn't do it. I eventually got into Mercedes and had to replace the compressor. $2,800 dollars later, my AC is as cold as it's ever been... LOL...