http://www.autotropolis.com/cs/forums/304/ShowForum.aspxDiscussions directly related to the Pontiac Grand Prix — For owners, potential buyers and enthusiasts.enCommunityServer 2.1 (Build: 60809.935)http://www.autotropolis.com/cs/forums/thread/34288.aspxFri, 03 Jul 2009 03:01:16 GMT47d518e0-6f86-4bcb-9b63-62b215176eac:34288Z71kitty0http://www.autotropolis.com/cs/forums/thread/34288.aspxhttp://www.autotropolis.com/cs/forums/commentrss.aspx?SectionID=304&PostID=34288I had a similar problem with my 1992 Pontiac Grand Prix. It was some kind of sensor but I don&#39;t remember which one right now. I hope this helps a bit.http://www.autotropolis.com/cs/forums/thread/34245.aspxWed, 24 Jun 2009 02:02:23 GMT47d518e0-6f86-4bcb-9b63-62b215176eac:34245dontsmokenomo0http://www.autotropolis.com/cs/forums/thread/34245.aspxhttp://www.autotropolis.com/cs/forums/commentrss.aspx?SectionID=304&PostID=34245<p>When I turn on the heat / air conditioning the air flows out of all the vents no matter what setting I have&nbsp;it set on.&nbsp; If I have it on the windshield or the vents it still blows out of all of them.&nbsp; It blows the most on the floors.&nbsp; It doesn&#39;t do anything when I change it.&nbsp; Any idea what it would be?&nbsp; </p>