When I press the drivers switch to unlock all 4 doors the rear drivers side lock only comes up part way and does not unlock completely. The lock mode works fine.

Any ideas?

 

solenoids are usual suspects but you may want to remove & inspect the latch assembly carefully. i've found some in the past that have an issue allowing one direction to work fine and not the other. a small broken spring would fall out if shaken. wish i could tell ya an easier way to check it but cant think of any.

 

Try using the search function or google it. You may find the a similar thread and then it'll lead you to other f150net site which has the write up on how to fix sluggish doors.

 

Thanks

I will check the latch assembly first as the lock comes up part way but not enough to unlock it. It works about 30% of the time so maybe it's a weak spring.