2001 Clk55 Amg Radiator Fluid/coolant Level Question? Resevoir Full!?

[Johnny916]

Hi, earlier I took my CLK55 AMG for a spin but when I got back I noticed there was a greenish watery puddle on the garage floor underneath where the engine/radiator normally is parked..

I'm not sure what the overheating level is but the temperature gauge is slightly below the 3/4 mark. It's not too close to the red mark and I'm not sure if that's where it is normally at.

My question.. How do I check if there's coolant inside my radiator?? I checked the resevoir and it's full. When I shut the car off earlier the fluid must of been real hot because it was steaming.

I looked underneath the car while it was parked else where and I see no signs of a leak! It's not dripping from underneath or anything.. But I guess it could also be because the radiator may have already drained itself out??