Temp running hot when ideling

I have Audi A3 97/98 model.
Just recently temp is going really hot.
I checked but there is no leak in anywhere. Just the steam coming out from coolant container. (Boiling)

I did flushed the radiator and refilled the tank but still goes up high.
I have noticed radiator fan does not run at all. It only runs short time when I unplugg the radiator drainning hole.

Is this thermo problem or water pump problem?

Anyone one ?

I had the same problem it was a fuse , one of the fuses that are on top of the batterrie .
With ne it semmed ok when i had the air con on but other wise y got very hot so that was the solution .
hopw ive helped