"part 4"

assuming the rods are now grease and moving freely, you can now reconnect the plug to the motors to find out whats wrong with them

don't hook them back up, just push the plugs back in again

when you do the locks may cycle, which is why it's important not to close the doors and lock yourself out

either pull the hooked part or push it in, it'll have a rubber boot over the top

this will either close or open the doors to the rest of the car (other than the opposite side front door as you will have left that disconnected as yet)

if it all works as normal, disconnect the plug and do the same thing on the other side

this way you can work out which motor is sounding off

if they both sound fine then the next thing to do is hook them back up again and see if they still work with load on them

if they are fine and dandy then your grease thing worked and you should be ok

if it doesn't then you know you'll need a new motor, with 4 wires and not 3

if you have to find the later motors they will still work and plug in, you just have to cut and shut the wiring