[beaster]

When I bought Subaru Forester sg5 1 month ago, we noticed some leakage and mechanic decided that it was leakage from AT which was a bit overflown.
But yesterday I noticed the engine temperature rising high. During the driving I saw the coolant temperature indicator was behaving erratically like going to normal and than up to the red again. The engine coolant (red colour liquid) was almost at the top of the of the coolant reservoir and engine bay was sprayed with the red stuff.
This morning when I checked the level of the engine coolant, I didn't see any.
It looks like the coolant reservoir is empty and small mark on the asphalt under the car.
What's going on?

Any suggestions which coolant I have to put in?

Thanks.