My trunk won't open in my 92 park ave.

first check glove box for a trunk release button ---you can notify a locksmith or have a dealer cut a key using vin number of vehicle --the following link has video showing how to enter trunk by removing rear seat
Getting Buick Century trunk open without the key

If the freon level is ok, you have an electrical problem somewhere. The system will not activate because the control module "thinks" the freon level is low or because of another problem. It could be the module too.
You'll need a shop manual to get the test procedures for climate control ac to check the components and circuits.

you might try lubricating the trunk latch with a silicone spray or wd-40 and unlocking it with the key while it is open. There is a chance there is a small broken spring in the latch that is not pulling it over to full unlock position and when you tried to shut the trunk it is actually already in the locked position.

Call a lock smith. Your insurance will most likely pay for lockout service. Your other choice is to pry the lock out, and then use a large screwdriver to turn the latch, which will open the trunk.
I'd go with the first option!

If the taillights needing replacement are not the turn-signals or brake lights: Open the trunk.There seven 10mm nuts that need to be open, 3-(left),1-(center), 3-(right). You will ned a deep 10mm

Read more: http://wiki.answers.com/Q/How_do_you_replace_tail_lights_on_a_2001_Park_AVE_Buick#ixzz1CSCPmkrU

The latch on the deck lid needs to be clicked open so it can catch the striker. Try key to unlock and see if you can get the latch hook open.

sounds like the latch on the trunk door is stuck open try to lube with wd40 , if wont work needs replaced hope this helps

a garage door opener in your area is most likely doing this. back you car down the drive and park close to the house or wall.

places to look, in the trunk, behind the bumper or up behind the back wheel