drivers side door switch doesn't work on 2004 Lincoln Town Car

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drivers side door switch doesn't work, how do I replace the switch and where is the best place to purchase one
(1) Answer
Purchase a door ajar switch at your local dealership; they are inexpensive.

Before you do that, lubricate the latches on your Town Car doors. If you lube them and then open and close them a few times, you may find they start working again. They often gum up and bind.