To fix an air conditioner that is running but failing to blow cold air, follow a systematic diagnostic sequence. Step 1: Check your indoor thermostat settings to ensure it is set to "Cool" and the fan is set to "Auto." Step 2: Inspect your indoor air filter; a severely clogged, dirty filter starves the system of airflow and causes evaporator coils to freeze over. Step 3: Inspect your outdoor condenser unit to ensure airflow is not blocked by leaves, dirt, or debris. Step 4: Check your electrical breaker panel for a tripped breaker. Verification: Hold your hand up to supply vents to confirm chilled air begins blowing once issues are resolved.
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