Power Door Locks
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I think this is the fix for your problem.
The actuators have a problem and your description sounds like the falure they exhibit. Mine did the same thing and my friend is a Ford service writer. He said just replace them and the problem will go away. I think there is a post on this board about them too. Something about a thermistor that goes bad. Another bad Ford design I guess. Click here to see the post - Very good one!! Add this to my odometer going bad, my failing Passenger Air Bag Off light..... and the real kicker - my spark plug blowing out of the head!! LOL - but I guess one of the good things is that this forum is here to help and I fixed all but the spark plug problem myself!! On one hand I am frustrated with the truck, but on the other I am glad to be able to work on it and find so much good information on it here!! Thanks to everyone on the site for the help!!!