I have a 2004 crown victoria there is a clicking in the dash , withthe key off & out of car it still click . the only way to stop it is to disconect the battery I was told it was temp blend actuator ,it seems it is under the dash if I can get to it it can be replaced , how come even with the key off this thing keeps clicking . Any help with this would be a great help . thank you in advance mike d.

Do you have the EATC or the manual AC? If it's the EATC, you have a climate control module that communicates with the blend door, and could be moving it even after turning car off. You can try pulling the fuses for the blend door, #16 and for EATC #23. If clicking stops, it may well have been blend door. If you join Crownvic.net, they have a handy "how-to" to remove and replace blend door actuators without fully removing dash. It does involve loosening it and propping passenger side up on a block of wood to get to the actuator through the air bag opening. You have to be sure and get the CORRECT actuator too, as there are two types, one for the manual AC and one for the EATC. BTW, while clicking is a common symptom of a bad blend door or actuator, clicking can also be associated with the GEM (generic electronic module). So be sure to determine if it's the blend door or GEM before you tear into the dash.