Adjust the striker if door otherwise aligned ok.
Check to see if the door is just a little bit lower than the door frame pin. If its lower then check the hinges for tightness. If they are tight but worn then the hinges need to be replaced to get the door to align.
On a 2001 Mercury Cougar : The fuel pump shut off switch ( inertia switch ) is located in the drivers foot well behind the kick panel ( there is an access hole ) * the kick panel is the interior trim panel , in front of the front door , beside the persons feet
The door ajar light might stay on in a Mercury Mountaineer if a door is not shut properly. Sometimes a door will seem like it is shut, but will not be shut enough to trip the light off. Check for dirt or other debris in the door latch for all doors.
It sounds like the security alarm is stuck. While this is happening take the key out of the ignition and shut the drivers door, then lock and unlock it with the key. If the problem stops even for a minute then the alarm is the problem.
According to the 2002 Mercury Cougar Owner Guide : The fuel pump shut - off switch ( inertia switch ) is located in the drivers foot well , behind the kick panel ( there is an access hole )
On a 1999 Mercury Cougar : The fuel pump shut off switch ( inertia switch ) is in the drivers footwell behind the kick panel ( there is an access hole )
How do you remove the rear door panels on your 1994 Mercury Grand Marquis They are shut and will not open the locking mechanism has fallen down inside the door?
Look either in the kick panels or the driver's side trunk panel
How do you know it won't open if you can shut it and you should probably just buy a new door
either you need a new wiper switch or a new wiper motor one or the other has a short in it
let the door be shut
Use a small screwdriver or ink pen to apply pressure to the latch while pulling on the door handle.