If your air conditioner is blowing hot air after recharging the AC system with a refrigerant fix, there could be several reasons for this issue:
Refrigerant Leak: The most common reason for hot air blowing from the AC is that the refrigerant might have leaked again. If there is a leak in the AC system, the refrigerant will escape, leading to a loss of cooling capacity. Recharging the system without fixing the leak will only provide temporary relief, and the problem will recur.
Improper Refrigerant Charge: Recharging the AC system requires precise measurements of the refrigerant to achieve the correct charge. If the refrigerant was overcharged or undercharged during the process, it can result in improper cooling performance.
Contaminated Refrigerant: If the refrigerant used for recharging was contaminated or mixed with other substances, it can lead to poor cooling efficiency and affect the performance of the AC system.
Faulty Compressor: The compressor is a crucial component of the AC system that pressurizes the refrigerant. If the compressor is faulty or not functioning correctly, it won't be able to circulate the refrigerant properly, resulting in hot air blowing from the vents.
Electrical Issues: AC systems rely on various electrical components, such as sensors, switches, and relays, to operate correctly. If there are electrical problems or faulty components, it can lead to improper cooling.
Airflow Issues: Restricted airflow over the evaporator coil, such as a clogged air filter or a malfunctioning blower fan, can prevent the heat exchange process, causing the AC to blow hot air.
System Damage: If there was a pre-existing issue with the AC system, recharging the refrigerant may not address the root cause of the problem.
To diagnose and fix the issue correctly, it's essential to have a professional HVAC technician inspect your AC system. They can identify the underlying problem, repair any leaks, ensure the proper refrigerant charge, and address any other issues that may be causing the hot air blowing from the vents. Trying to troubleshoot and repair complex AC problems without proper knowledge and tools can lead to further damage and may not resolve the issue effectively.