[encantotom]

on my 02 there is a 12v solenoid valve that is on the bottom of the water separator.  when the compressor shuts off, 12v is applied to the valve that when it opens it bleeds pressure off the head by blowing any water in the bowl out through a hose on the bottom and at the same time that bleeds the head pressure off.  these compressors are absolutely not made to start up with that kind of pressure on them.  

see the picture below.  

btw, your water separator looks like it has been replaced to me.  looks pretty new.

tom