Spring has arrived! However my AC appears to not be working. The fan blows, air comes out, but it does not get very cold? Anybody have any ideas?

2002 ML320

 

first question do you have an acutal AC button, and is it pushed,i think those MLs do have an AC button. if it is then you prob. need a charge and there is prob a leak in the system.

 

I do have "AC off" button located below the automatic button (auto climate control).. I tried it with it on and off.. no difference.. I also have climate control and selected 16 degC, should have activated the AC.. did not really get cold?