99 Expedition Door Locks

[kelligreen]

I have a 99 expedtion that has always as a door lock quirk. Over the past 2 years it has gotten worse. The car locks no longer unlock when the motor is turned off (but do lock when I start driving). Therefore I must press the unlock button to unlock the doors. In the summer, or anytime the weather is warm, the driver side button does not work. When pressed nothing happens, not even a noise suggesting a attempt to work. I can unlock the doors with the passenger side button or the keychain transmitter. Has anyone had a similar problem or know what might be wrong?

[bstedh]

Well my 98 has never unlocked when shut off but i have only had it a couple of months. It has never been a problem for me as the front doors unlock when you pull the handle. It is a little annoying if you have a passenger in the back as they have to manualy unlock thier door.

As far as the drivers switch i would take a trip to the local junkyard and try to find 2. One to dismantle so you understand how it works and another to replace yours to see if it helps. Also some good contact cleaner sprayed into the guts of the switch may fix it if it's just gunk built up in the switch.