I am looking for a part related to the trunk lid pulldown for a 98 deville

The Pull-Down Motor is bad, you need to replace it.

Do you mean the pulldown is not working, or the trunk lid latch is not connecting to the pulldown assembly when you try to close the trunk?

This latter case typically happens when someone slams the trunk lid down several times not realizing there is a pulldown system and thinking slamming it will make it close (this often breaks something). Check the latch on the trunk lid - if it's in the closed position, use the key to try to move it to the open position and try gently closing the lid again.

If not, there is also a switch on the pulldown assembly that starts the pulldown motor when it is depressed by the closing trunk lid - you can also check this to make sure it's working. Otherwise, either the latch or the pulldown assembly has been bent/broken.

Try this forum. I had the same problem and they were saying to take off the trunk release actuator. I did and it worked. Don't take the whole piece off of the trunk lid (although if you do, it's easy to put back on), but take the one piece (the actuator) off of the latch. I don't know anything about cars and I was able to do it. Not hard at all. Take a look at the forum:
http://www.automotiveforums.com/t677633.html

replace the motor. it only cost a few buck at a junkyard. had same proble. only took a few minutes to fix

If you have automatic pulldown watch your fingers. If you hear the pulldown working the motor is good. If not the striker needs adjusting or the motor is bad.
Check the edges of your weatherstripping and if the hinges are rubbing inside the trunk.

If you have a manual setup look under the lid to see if the striker is loose and adjust. Sometimes the part in the trunk is the adjustable side.

Replace thr pulldown switch .

i had the same problem, there is a stop switch that is bad. (got one from a junkyard but it was bad also). haven't found one online yet, but will ask my local ford dealer if part is still available.
so untill i find one, i got the motor to stop at the all the way down position (trunk closed) and then unpluged the motor.

did it quit making the noise when you lightly push down on the trunk? most people slam these trunks and your not suppose to you are only to put light pressure on them and they pull it closed theirself.. you might check your relays under the hood and look in the box lid to see which one it is.. if this is not the problem you might have to replace the motor to the latch .. you might check with a test light to see if there is power to the motor first though .. thanks and holler if you have more Jerry .

Ok, you have an auto trunk opener/pulldown. The battery is dead and you opened the trunk with key. SO, now here is what happened. The trunk pulldown motor and latch did not go up as it normally does, in order to catch the the trunk lid as you close it. Connect a battery charger to the battery or put jumper cables on with another car. It should raise. If not flip the little lever on the BLACK switch near pull down latch.

this is straight out of the book ok

1. Open the rear compartment lid.
2. Remove the rear compartment lid trim.
3. Pull back on the rear compartment trim panel.
4. Unplug the lamp connector from the rear compartment lid wiring harness.
5. Press the grommet out of the rear compartment lid.
6. Remove the nuts retaining the lamp assembly to the rear compartment lid.
7. Remove the bulb.