gsxrjeff

So I have a 2003 malibu and the a/c will randomly turn on and off. There is always air blowing but sometimes its cold and sometimes its not. Whenever it turns on/off i can here a click under the hood. It usually flickers when its on the first 3 levels and if i turn the fan to level 4 or higher the whole dashboard seems to shake as if there is something vibrating harshly underneath.
Anyone have any ideas as to what could be causing this? I appreciate the help.