Troubleshooting Air Suspension.

[timrec]

The rear of my 2000 Expy has dropped. I think there is an issue with the air suspension. I used to hear the compressor kick on every once and awhile, but since the rear has dropped I haven't heard the compressor kick on.
How do I troubleshoot the air system and where do I start?
thanks.

 

[DavidExped01]

check out the link on this other forum...good info, there is a link to a previous post in there as well.

http://www.ford-trucks.com/forums/showthread.php?t=493486