Is it normal for 2000 Lincoln town car to do this?

[Zozo]

I bought this 2000 Lincoln Town Cat and everything is cool, except the fact that the car as soon as I turn it off, the back side goes down slowly, in other word, the air suspension in the back is lowered. Overnight its down, as soon as I put the key and start the car, it goes back up level!
I drive it, its level like any normal car.
Some people told its leak, many others said its normal because they suppose to act like this!

Any mechanic or someone knows about this help me !
If its not normal, what should I do to fix them, Cheap!! I don't want to put $800 in this thing.

Thanks in advance fellows!

 

[RandyKeilback]

The air bag system is leaking, soon it will not inflate. There is a kit to install regular shock absorbers

 

[Joe]

Those Lincolns are notorious for doing that, and only in that sense is it "normal." I'm not a mechanic, but I owned an 87 Lincoln that did that.

There might be a way they can replace that air suspension with a regular suspension, but I don't think much of anything today is all that cheap and I haven't priced things lately because I haven't had a car at all for a few years because of this very reason.