This question is too broad. If it is a refrigerant leak it is most likely in one of the 2 coils. It could also be in the line set wherever the copper lines were joined with couplings and elbows. It is also possible that the line set has been punctured with a nail during construction or home improvement.
You probably have a leak. You should take it to a mechanic, have the system inspected to locate and fix the leak and then recharge the system. By doing so you will be a responsible citizen of Earth, respecting the environment and your fellow animals on this polluted but ultimately cleanable planet. You will probably just go to your local automotive store, buy a can of refrigerant and recharge the system without plugging the leak. After all, repairs and expensive and who the heck wants to go to all that trouble? Have you seen how hot it is?!
The 1999 Oldsmobile Alero does not have Freon in the A/C system. It contains R134 and not Freon which is R12. As I am sure you do not have the proper equipment to recharge the system plus the fact it is illegal to add refrigerant to a system with a leak, until the leak is repaired, take it to a professional and have the leak repaired. You have a leak or you would not need to add refrigerant.
Whether the leak is miniscule or not is not the issue. If your system is leaking refrigerant, you must have it repaired. Any technician that puts refrigerant in a leaking system and does not identify the leak is not worth keeping. Answer is, since it is a sealed system, if the unit is losing coolant there is a problem, there is a leak. However, as a practical matter and since the leak may be miniscule, having your system checked every couple of years is not a bad idea.
Well if that is the code you are getting when using a scan tool , it means there is a leak somewhere in the fuel/evap system. To actually pinpoint the leak, you would have to do a "smoke test" to see where the actual leak is taking place. That type of test really needs to be done by a mechanic that has the equipment to do it.
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