* Low Refrigerant: This is the most common cause. A leak in the system has reduced the amount of refrigerant, preventing efficient cooling. The compressor cycles to try and compensate, but without enough refrigerant, it's ineffective. This requires professional attention – you need to find and repair the leak, then recharge the system.
* Refrigerant Restriction: Something is blocking the flow of refrigerant through the system. This could be a clogged filter drier, a kinked line, or even ice buildup in the evaporator coil (though ice buildup usually leads to *no* cool air initially). Again, this needs professional diagnosis and repair.
* Compressor Issues (Less Likely Given Cycling): While a failing compressor *can* cause cycling, it's less likely if the compressor is actually engaging and disengaging. A failing compressor would usually lead to inconsistent operation or complete failure to engage. However, it's still possible that the compressor is weak and struggling to keep up with the demand.
* Condenser Coil Problems: A dirty condenser coil (the outdoor unit) restricts airflow, reducing the efficiency of the system. Clean the coil with a coil cleaner and a garden hose. If it's severely damaged, replacement might be necessary.
* Electrical Issues: Less common, but a problem with the compressor relay, wiring, or the capacitor could cause intermittent operation.
What NOT to do:
* Don't add refrigerant yourself. Improperly adding refrigerant can damage the system further. Refrigerant handling requires specialized equipment and knowledge.
What you SHOULD do:
1. Check the condenser coil: Clean it thoroughly. If it's extremely dirty, this could be the entire problem.
2. Call a qualified HVAC technician: This is the best course of action. They have the tools and expertise to diagnose the problem accurately and make the necessary repairs. Attempting repairs yourself without the proper knowledge could lead to further damage and more expensive repairs down the line. They'll likely use gauges to check refrigerant pressure and identify the source of the problem.
