When your central air conditioning unit is running continuously but failing to blow cold air through your indoor vents, the issue is typically caused by one of several common failures. First, a dirty, clogged air filter can severely restrict airflow, causing the indoor evaporator coils to freeze into a solid block of ice. Second, low refrigerant levels caused by a hidden leak prevent the system from absorbing heat. Third, a dirty outdoor condenser coil or a failed compressor capacitor can stop heat exchange. Verification: Check indoor supply vents for chilled airflow and inspect the indoor air filter.
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