Take off door panel & remove old lock accuator. Universal accuators are available from around $20.00 (stereo shops) or original from around $120.00(dealer). One you see the old & new one its self explanitory. The universal accuators come with brackets and you make them fit, the Ford ones are a direct fit with no modification needed.
Check heatertreater.net for diagnostic information and a fix for the blend door/actuator problems endemic to this model.
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To replace the actuator on a Ford Fusion it would be best to take the vehicle to a mechanic to insure it is done properly. For those who have mechanical experience there are auto repair guides for the Ford Fusion 2006.
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278.00 plus tax dealer only