what is a p/s cooling line? on 1999 Chevrolet Cavalier

I was charged for repair of power steering cooling line. what is a cooling line?

Asked by for the 1999 Chevrolet Cavalier
Usually the pressure side of the Power Steering system has a long hose that has a metal section, so the fluid can cool. This is most likely what they replaced. The PS fluid can get as hot as radiator coolant!!