silhouette ELC

I Have A 1997 Silhouette And Just Changed The Compressor On The Electronic Leveling Control System. Since Changing It, Now With The Key Off, It Runs For A Short, Then Shuts Off. After A Short Period, It Comes Back On And Runs Again For A Short Period. You Can Hear A Slight Relief Of Pressure And Then It Runs For A Short. Is This The Normal Operation??????