1998 Buick LeSabre Question: I have a sound in the rear,maybe passenger side,like a motor

It starts and stops.Was told it was the air shocks so I replaced them, now I am told There is leaks in my air shock hose. If I replace the hose will this start and stop motor sound stop? Im told that it is just trying to level the air in shocks but because of leak it cant do it !