* Low Refrigerant (despite recharge): A leak in the system is the most likely culprit. Even if it was recently recharged, a leak means the refrigerant is escaping, rendering the recharge ineffective. A proper AC system diagnostic needs to find and fix the leak before any further refrigerant is added.
* Compressor Failure: The compressor is the heart of the AC system. If it's malfunctioning or seized, it won't circulate the refrigerant, regardless of how much is in the system.
* Condenser Problems: The condenser is responsible for releasing heat from the refrigerant. A clogged or damaged condenser can prevent proper cooling.
* Evaporator Issues: The evaporator is where the cold air is produced. A restricted or dirty evaporator can hinder airflow and cooling.
* Expansion Valve or Orifice Tube Malfunction: These components regulate refrigerant flow. A problem with either can prevent proper cooling.
* Blower Motor Problems: While less likely to cause *only* hot air, a weak or malfunctioning blower motor might not be able to push enough air through the system.
* Blend Door Actuator: This controls the air mix between hot and cold. A faulty actuator might be stuck on the hot setting.
In short: You need a professional AC diagnostic. Simply recharging the system without addressing the underlying problem is a waste of money and won't solve the issue. A mechanic can use specialized tools to identify the source of the problem and perform the necessary repairs.
