When i idle my Benz runs hot..near 120. If I keep moving it's fine.

I guess the engine's temperature was okay, while traveling, since you only mentioned hot while idleing. Then, you may be right about the Fan or Fans, not working. If I remember correctly there are two fans or even three fans: one fan from engine's crankshaft behind the radiator, another fan in front of radiator for Air-conditoner's condensor. You can check them by idling the engine, open the hood and look at the behind fan, it should turn on before 100 mark on temperature gauge. Then, turn on your Air-conditioner and check if the front fan turn on. If either not working, you need to take to a good mechanics soon, this can damage your engine from overheat!!!