I
got my car back from the shop and all 4 corners are down
The
first thing that comes to mind is that the suspension switch was not turned off
while the car was raised.
NOTE:
The
module has the ability to make any adjustments it feels necessary for an hour
after the ignition is turned off. This means raising OR venting.
When
a Ford/Lincoln air suspension equipped vehicle is raised without turning the suspension
switch off, the module doesn't know its on a rack, it thinks the car is really
high. The module will instruct the compressor to vent the air out until the car
is at normal height. Because the car is on a rack and the wheels are hanging,
the sensors will never get the normal reading because no matter how much air is
vented, the suspension won't lower. The module doesn't know any difference, so
it vents until the 45 second "time-out". After 45 seconds, it will turn
the vents off and shut down the system.
If
the vent solenoid and dryer have no restrictions, all the air in the struts/springs
will have been vented out and the car will lower to the bumpstops when the rack
is lowered.
"IF"
the system is in decent shape, the car "should" raise up to normal height.
On an old system, it may require more than one ignition cycle, due to a 90 second
compressor run time limit.
If
you DO hear the compressor running but after several cycles but the car
still won't raise up, you may have a leaking air strut/spring. You may try to
use a floorjack to lift the car up "a little", then turn on the ignition.
This may help get the car past the cracks in the rubber, which may seal the leak(s)
enough to raise the car.
If
you DO NOT hear the compressor running, check for power at the compressor.
If you don't have power here, you may have a bad compressor relay.
