If your air conditioner continues to blow hot air immediately after adding a refrigerant recharge, it indicates that the underlying refrigerant leak has not been repaired, meaning the newly added freon has already escaped. Alternatively, the issue may not be low refrigerant at all, but rather an unrelated mechanical failure—such as a broken compressor capacitor, a tripped thermal overload relay, a bad contactor switch, or a severely clogged indoor air filter choking airflow. Verification: Inspect refrigerant copper lines for fresh oil leaks and test component electrical continuity.
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