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Most likely rust has settled in. The best way is to remove the door panel and spray all the parts with either a rust spray, or Wd40. If you cannot open the door to get the panels off, then roll down the window, and use an oil can and squirt oil all over the lock parts, and work the lock at the same time. Might take some time, and put a piece of carton under the door to catch all the oil. Good luck.

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Q: How do you fix the rear door locks on a 1994 Mercury Topaz that will not unlock manually?
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