You are considering disassembling your PSP slim, either because you just bought a new housing, or considered to buy one. The trapped air between the inside and outside door can be a factor in door closing. Wherever air pressure is a factor, including negative or positive pressure situations, I have have been able to get door closers to close and latch the door consistantly by adjusting them to a slow swing-speed and a somewhat fast latch-speed. If the closer stops closing the door before it’s closed all the way, or actually spings back when you try to manually shut the door, the arm is probably installed on the shaft incorrectly.
Download the instructions from the door closer manufacturer’s web site and see if it is installed correctly. If the arm makes noise and bounces up and down while the door is in motion, tighten the fasteners that hold the arm to the closer, to the header, and at the knuckle that holds the two parts of the arm together. If your door closer is slamming the door and cannot be adjusted to do otherwise, either the fluid has leaked out or the valve seals are worn out.
If the door closer has no spring tension and the spring tension adustment turns round and round with no effect, the spring is broken the door closer must be replaced. Usually I hear of transom closers referred to as ‘overhead concealed closers’ and floor spring closers as simply floor closers, but a rose by any other name will close the door just the same. There are a few other types of door closers, namely transom closers/overhead closers and floor springs/floor closers. The rate at which the oil is released from the piston is the speed at which the door closes.
Transom closers are concealed units set into the transom of a door frame, floor springs or floor closers are set into the floor near the doorjamb sometimes called the door post. Perhaps your cover is held on by tension, but was put on the closer while there was wet paint on the door. Glad my help has helped with getting the door to close all the way and to stay shut keeping the heat in and the cold out. Don’t forget the classic role of baking soda in the refrigerator to absorb odors.
The door does not have a latch, the spring was adjusted and has helped a lot, thank you again. Sounds like you have a new screen door or storm door, probably aluminum, and maybe the pneumatic door closer it came with is not so good and is not working properly. Since your door is new, perhaps you can take the closer back to wherever you got your door and they will give you a new closer. A good door closer can also make it difficult to slam the door, but it will not get rid of a squeak. The sagging of your door is a problem that is most likely unrelated to your door closer.