Rear Air Suspension Sagging Problems

[wch]

I forgot to add to my previous post that I also have a leak in my air suspension although I suspect it is a stuck valve. I have read the previously posted threads on this but did not see my problems.

Here it is: The pump is the originial single chamber pump and does not constantly run. When the truck is parked, sometimes the rear will be sagging. It does seem to be affected by the temperature. The colder it is outside, the more likely the rear will sink. Again, not always.

This seems to indicate that there may be a valve that is getting frozen open as moisture may gather in the lines.

Any thoughts or experiences you can share is appreicated.

WCH