Thanks , for the diagrams Ranger , I was looking for something like this in the FSM but couldn't find it .After" exercising "the system like Basscatt recommended , I noticed that in the air conditioning mode the drivers vents are not blowing as hard as the passengers , in the heat mode they appear to be equal . Momentarily I thought that It was working but then it went back to not working . Is there anyway to physical check and move the blend doors by hand to check for movement . Also is it possible for a screw or something to fall down a vent get in there and mess things up . I've had the dash pad off so who knows . TX again for all the help.