RE: Power door locks
If it makes noise, maybe there is something else wrong. Look inside at the latch and make sure all the rods are hooked up and look to see if the actuator is moving up and down when you hit the button.
If it is the actuator, they are a bit of a pain to replace. You need to drill out the big rivet that holds it in. You can see the rivet below the latch when you open the door (I just replaced my rivet with a big round top stove bolt). Then you need to disconnect the wire plug and fiddle with the actuator to get the rod disconnected.