Air Suspension help

[4whlmama]

Have an '02 XLT 4x4 5.4... Everything was just fine with the suspension. Then I hauled a queen size mattress and bed frame home. On my way home, the "ck susp" light flashed a couple times and then went off and the rest of the way home the truck rode fine, light never came back on or flashed. A few hours later, I went to leave and rough ride!!! The suspension in the rear is completely deflated and the compressor never came on. I turned around and headed home.

Where should I start to narrow down the problem? The passenger side switch is on. I read somewhere there is a switch in the back?? I have had this rig for 12 years. Never knew of or seen a switch in the back. Anyone have any pointers?

Thanks

 

[docraymund]

The airbags might be leaking. Jack it way up and inspect the lower portions of the bag if you see signs of abrasion, you might need to replace them.

 

[4whlmama]

The compressor all of the sudden, isn't coming on at all. Prior to this it didn't come on very often to indicate that there may be a leak in the system anywhere. It would come on for a short moment after you first start it and put it in gear and that was pretty much it.

 

[docraymund]

There's a load leveling sensor at the back connected to the chassis and rear differential. You can test that. There's a video on YouTube.

 

[GAINMOB]

how long have u had this truck?