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Remove glove box liner. Blend door is located in the heater/evaporator housing. There are several kits available to repair blend door shafts as well as troubleshoot system.
I ASSUME the block heater in a 2006 Ford Freestar would use ( 600 watts ) like my Ford Explorer 4.0 liter V6 engine does
Can't say for positive sure, but I would expect the Freestar/Monterey blend door actuator motor to be much like the Windstar. Common failure, easy replacement - about $40 See "Related Questions" below for links to the Windstar related blend door discussions
I do not have heat in the car and the blend door clicks. How do I access the blend door in a 2005 Ford Explorer?
2007 ford freestar
Ford Freestar was created in 2004.
How do I locate the heater blend door actuator in a Ford f150 pickup
Do a Google search on Ford Explorer blend door , there are quite a few articles and a couple of videos
Deep under the dash next to heater core
The blend air door is probably broken.
Do a Google search of Ford Explorer blend door , there are lots of articles and some videos
2005 ford freestar where is the coolant temperature sensor ?