How do you install rear passenger seat reclining handle on a 2008 mercury mountaineer.

Question edited for clarity and errors.
Question moved from Seat, (Spanish car company) to PT Cruiser.

You would be better to fly, or put her in the back seat with lots of pillows and use the centre lap strap as a seat belt.

If you pull the seat all the way forward and remove the headrest, you should be able to see the maximum recline, but electric seats have a stop on them.

Power Recliner
The driver seat has an electro-mechanical backrest adjuster. The backrest adjustment switch is located on the side of the seat cushion side shield and is part of the seat control switch. The recliner motor is mounted to the backrest frame. Power recliners and motors are only serviceable by installing a new backrest frame assembly.
Does yours have Driver and Passenger Power Seats Without Memory Or Power Driver Seat With Memory ?

B1666 Seat Driver Recline Motor Stalled On-Demand If the motor does not operate, Go To Pinpoint Test L . If motor operates, Go To Pinpoint Test M . Take it an have it check !
Does your

It sounds like the inside of the recliner knob is stripped out. If you go to your local GM dealership and give them your VIN number they can order you a new one. Here is the removal and installation directions.
Driver or Passenger Seat Recliner Handle Replacement Removal Procedure

1. Use a flat-bladed tool to remove the plastic center cap from the center of the recliner handle.
   
   
2. Pull the recliner handle off the shaft.

Installation Procedure

1. Install the recliner handle on the recliner shaft.
   
   
2. Push the recliner handle firmly onto the recliner shaft until fully seated.
3. Install the plastic center cap into the center of the recliner handle.

Hope this helped please hit the accept button and positive feedback is appreciated.

Hi Lee, It could be a switch problem or the motor. Each function has a different motor. Regards John

In the 2002 Mercury Mountaineer, especially with the 3rd row seat, remove the trim panels at the rear of the back door and at the tailgate on the passenger side. You will see two panels where the wall seat belt is located, remove the top panel first and then pull the lower panel out.Then pull the lower trim panel forward CAREFULLY. Towards the front (near the door opening) you will see a small black box (says Security Unit) On it in fairly small print will be the 5 digit code.
[ONE set of FIVE numbers and that is your CODE number.]

Try removing the plastic cover over the seat pivot and look for loose lever linkage rod components. You may be able to engage seat locking pawl manually. A pinch hazard exist so be careful where you place your fingers

On W-Body vehicles, the front seats are secured to the floorpan by two front hook attachments and two rear bolts installed to nuts welded to the floorpan.
The manually operated two-way front adjusters provides only fore and aft movement of the seat. When the seat adjuster handle located on the front seat is pulled up, the seat adjusters unlock, permitting travel of the seat. When the seat is in the desired position and the seat adjuster handle is released, the seat locks in place.
A power operated six-way seat adjuster is available. The adjusters are activated by three 12 volt, reversible, permanent magnet motors with a built-in circuit breaker. The motors are energized by a switch bolted on the seat side panel.
The three motors drive the front seat and rear vertical actuators and a horizontal actuator. When the adjusters reach the limit of travel, torque is absorbed through the rubber mounted grommets located between the motor and the support. An overload relay is provided in the circuit and will open should excessive stall be applied.
The optional 60/40 split bench front seats have seat back head restraints on the driver's and passenger's seat back. The head restraints are designed so they cannot be removed from the seat back without first inserting a small rounded tool inside the head restraint support tube to release the locking tab. The 60/40 split bench seat is equipped with a reclining mechanism on both the driver's and passenger's side. The recliner lever is located on the outboard side of the spring cushion. When the lever is pulled upward, the spring loaded dual linear reclining unit located in the cushion frame is released, allowing the seat back to be pushed rearward or allowing the spring loaded reclining unit to bring the seat back forward.
Bucket seats are equipped with manual reclining mechanisms. An optional six-way power seat adjuster is available. Some bucket seats are equipped with inertia seat back locks. This system allows the seat back to fold forward without requiring the occupant to release a locking lever or access to the rear seat area. During a sudden stop or deceleration, or if the front of the vehicle is nose down, the inertia system of the seat back lock will engage, holding the seat back in its rest position. A release lever is provided to allow manual release of the seat back lock when the vehicle is in the nose down position. The release lever is located at the lower rear outboard corner of the seat back.
Some W-Body vehicles (notably Pontiac coupes) have passenger front seats equipped with an E-Z Entry device. This is actuated, in an unoccupied seat, by completely folding the seat back forward disengaging the adjuster, and sliding the front seat forward to gain access to the rear seat area. To return the seat to its normal position, return the seat back to its rest position, and slide the entire seat rearward, engaging the adjuster.
W-Body rear seats are available in several styles including a rear seat with an integral child restraint device.

Use some penetrating lubricant on all pivot points and levers around the recline mechanism, and let the lubricant sit overnight. In the morning, try to work the recline mechanism free. (The vehicle is quite old at this point, and likely parts in the interior need lubrication. These parts should be lubricated annually.)

Ebay sells a replacement handle that looks exactly like factory handle but just screws on, it is a very common thing to break, as mine did.

Get the VIN# from the vehicle, either on a plate under the hood or on the front of the windshield down low. Once you have the VIN# which is (VEHICLE IDENTIFICATION NUMBER) contact mercury and they can give you all codes for the vehicle.