What you're asking really requires a more in-depth diagnosis. There are seven operating conditions of an air conditioning system, based on what the system pressures are in accordance to the pressure/temperature relationship.
Condition one is normal operation, while the remaining six result in insufficient cooling.
The possible reasons why you're not getting adequate cooling out of your AC system can vary. Low refrigerant is the one people like to assume is the reason, and it is a pretty common one. But, DIYers tend to typically just throw a can of refrigerant into the system, and fail to understand why that "fix" doesn't last for any duration of time. If you've lost refrigerant, then you have a leak in the system, and need to repair it if you don't want it to be a recurring problem. I work in a shop which has equipment to evacuate and recover refrigerant, so that's the first thing I do.. then I see the amount of refrigerant recovered vs. what's supposed to be in the system.. if what I recover is substantially lower than what's supposed to be in the system, then I perform a leak test by charging the system with compressed nitrogen through a manifold gauge set, and spraying the AC lines and fittings with a soap and water mixture.. keep in mind that, while a lot of people use the soap and water method, it is not recommended if you're not going to pressurize the system (like I do with the nitrogen) - if the leak is on the low (vacuum) side of the system, that soap and water can end up in the AC system, and your problems increase significantly at that point... pressurizing the system with 250psi of nitrogen retards the vaccum, prohibiting this from happening.
Other possible reasons for your problem could include fault low or high pressure switches, excess refrigerant and/or PAG oil, a faulty compressor clutch, electrical problems, blockage in the system...
This type of work really isn't a DIY task, and I'd recommend you seek the services of a professional.
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