Refrigerant for a 1996 Buick Skylark is inserted into the low pressure AC hose. This hose is found on the left side of the engine bay.
Low pressure port which is the larger hose.
Your car uses 134 refrigerant. But a kit at most auto stores, etc. The kits have easy instructions to follow better than can be explained here.
You take it out and put a new one in
most likely cause is that it has non-condensables in it, probably water vapor from a leak on the low side next most likely is that the condensor (radiator) is clogged up with bugs or else the fan isn't working next would be that someone has put an alternate refrigerant in it
You will see the plastic connectors on the back of the headlight mounting plate. Twist to the left while pushing inward. Reverse steps to put it back.
The question you should be asking yourself is is this car still worth it?, not to put you down but an enging swap is at best of times labour intensive and expensive.
The 198 Buick Skylark was offered in a 2.5L L4 and 3.0L V6. Both power-train options were provisioned for automatic transmission fluid through the dipstick/tube assembly.
It is a big job. Get a manual from the parts store or from AUTOBOOKSONLINE.COM with your hands
theft system
Low pressure side of compressor Larger hose from compressor
Go with the names you know. I put Prestone in mine. No problems.
My 1998 Skylark has a switch on the bottom of the steering column I need to push in order to get the keys out of the ignition...