| After oil change, AirBags Leak
If you're experiencing a leaking air suspension system after a recent oil change, believe it or not, your problem was there all along. Having the suspension extend for something as simple as an oil change can aggravate an existing leak rather easy and push an already old and dry rotted rubber bladder over the edge. How? The rubber air bladder on a Lincoln Mark VIII airbag gets old and dry-rotted with age. This old rubber gets used to being used in a certain range of motion. Then all the sudden, the old dry-rotted airbag is allowed to extend out with the suspension and the old dry-rotted rubber is stretched. Did the oil change cause the leak? No. While the oil change didn't cause the leak, it did accelerate the leak. In other words, instead of the airbag leaking 4-6 months from now.....it's leaking now.
RULE OF THUMB: A Lincoln Airbag will always leak the worst while being driven and because the system is all automatic, you may have had a leak for 6 months or more without you even knowing.
Looking on the positive side, the leak is bad enough now to alert you something is wrong. If you went for another 6 months with it leaking a little, you may have damaged other parts in the meantime.
OVERNIGHT, THE REAREND GOES DOWN
One important thing to remember on Ford & Lincoln air suspension systems, is that an hour after the ignition is turned off, the system will automatically go to sleep. After the system goes to sleep, NO ADJUSTMENTS will be made(raise or lower)......and because there are solenoids on each airbag, no air should escape. If the rear end does go down, THATS AN INDICATION OF A LEAK!
Keep in mind that the first thing a lot of people do when the air suspension does something they don't understand, is replace either the module or the solenoids. While having a bad module or solenoid is a possibility, it is a pretty rare occasion.
As far as a bad solenoid goes, the real truth is that the Ford/Lincoln solenoids are a very good and dependable design. They very rarely go bad internally(internal bypass is very rare), but IT IS CRITICAL that they are to be resealed if they're removed.....and especially if the air spring is replaced! While not re-sealing the solenoids may not cause a leak right away, IT WILL cause a leak in the near future.
The truth is that an airbag leaking one night....and not the rest of the week....IS A TEXTBOOK AIR SUSPENSION LEAK.....early in the stages of a leak anyway. As time goes on, and/or temperatures drop, the frequency of the leak down will increase.
What is the problem?
In a nutshell, unless the solenoids have been removed in the past and not resealed, an overnight leak down problem WILL BE a bad air spring and it is ALWAYS recommended to replace these in pairs. They are the exact same age, so if one is leaking, the other won't be far behind!