What could it be?
 

Hi Guys,
Selflevel Inactive message on the dash.
It goes all the way up and releases the pressure.
Both air springs are 3 months old.
What could it be?
Control unit?
A stuck valve?

I can't undo the nuts on the compressor housing.They are sort of squeezed and turn with the studs.

take a dremmel and cut a slot on the stud, that way you can hold the stud with a flat head. Use an open end wrench to turn the nut.

That's a cool idea,thanks.
BTW
Is the suspension connected to A/C in any way other than an extra power being drawn when A/C is on.I know that Selvleveling is bitch when it comes to power too low etc.

you are correct. And it's just extra load, which the car compensates for by increasing idle.

And I would pull out all the relays in the back, and put them back in before doing anything else. There relays in these cars are something else. I purchased all of them just in case.

I wonder where that relay is.

by the fuses. And there should be one by the compressor.

Check to verify that the hall effect sensors are connected, wires and links to control arms.

Is that on both sides or just a passenger side?

pass side, at least on my 4.8is.