Welcome Horseman40 !!
We all have
'some' sounds from down there after shutdown, but only for a few seconds.
Curious question; if you open the drivers door while this sound is running, will it immediately stop then? As you know, these cars remain in accessory mode for about five minutes after shutdown (don't recall exact time), which is canceled by the drivers door opening.
You can put the Climate Control System into test mode to see if any problems are identified.
Search this forum for 'test mode' for more information, or:
http://www.automotiveforums.com/vbul...4&postcount=11
http://www.automotiveforums.com/vbul...ight=Test+Mode