Just purchased an 03 UL with 44k miles...clean car but i cant figure out if the air suspension is actually working or not...i dont see any noticeable difference when settings are changed....Is there a way to lower the car more without buying data suspension controller?

 

You may want to do a search on how to lower using the control arm method. Just using the Hi/Norm button will give you very little results. May be 1-1/2" height.