How is the tailgate lock/latch repaired on a 2000 Mercury Mountaineer SUV? The tailgate wont open even with the key?

Question edited for clarity.
Question moved to model category.

It is the same vehicle as the Ford Explorer. There are tips here.

https://www.explorerforum.com/forums/threads/rear-hatch-door-on-2000-mountaineer-wont-open.428648/

More help here

https://www.google.com/search?q=2000+mercury+mountaineer+liftgate+problems

Or do you mean the spring assist struts?

https://www.google.com/search?q=2000+mercury+mountaineer+liftgate+replace+struts

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Does the radio turn off if the passenger door is opened?

Normally, Ford puts a button inside the glove box. It should be in there, or under the right hand side of the passenger side dash board.

im really sorry I couldent help is it 2wd 4wd awd and is it a 6cyl or 8cyl

Sounds like the activator rod that goes from the door Handle to the latch is disconnected. You will have to get the door open to repair it and a good mechanic or tow truck driver can use a slim Jim kit to get the latch to release and then you can pull the door panel and find the problem.

I don't list the door lock cylinder available aftermarket, so you will probably need to get it from a Ford dealer.

no the latch could be hanging up, the keyless entry pad has no mechanical connection, lube the latch area generously, ....even pull the highest bolt holding the latch in place and with the red nozzel spry into the bolt hole .....hold handle in up position and close door like ten times or more to work the lube into moving components....... make sure when this happens that the lock is fully rising to allow to open,
may need and actuator also if thats not occuring.

Have someone check your car alarm it sounds like its not disarming.

spray a small amount of W/D 4o into the key lock and then put the key in and move it back and forward until the lock free up and also spray a small amount in the inside lock of the door as well and then do the same on the other side the reason you had this problem is because the last owner only used the remotes to lock and unlock the doors and not the key sometimes.

my v70 vovlo estate(2000) tailgate wont open.checked fuses ok.no sound from mechansim when key fob depressed as the others do.Cant get into the back panel or open door at all.can you help with a suggestion?