You can check whether the car raises and lowers using the button by the gear shifter. If its like my airmatic (totally trouble free in over 5 years incidentally) both red lights showing is the lowest setting, one light slightly higher, no light is the highest setting. Take a look when you first arrive to see if it is sitting evenly and not lower/higher on one or more corners. The airmatic pump should raise the car silently. Undue noise may point to a tired pump. As John above, airmatic is arelatively simple and mainly trouble free system. I'd take it over ABC anyday simply over the cost if either goes wrong.