407 steering pump

when my friends run on the steering wheel in the mornings, especially in cold weather, the steering gets hard after 10-15 seconds, and when I stop the car, the oil comes out of the pump tank cover and when I open the cover, the oil comes out and the oil comes out, but if I do not open the cover, it flows and cuts out of the air hole for some time. he stopped for a while but then he started doing the same thing