When your residential air conditioning system is only blowing a weak trickle of air out of your supply vents, it is usually suffering from severe airflow restriction, a failing blower motor, or a frozen evaporator coil. The single most common culprit is a heavily clogged, dirty air filter that starves the blower fan of air, causing static pressure to spike. Another frequent cause is an indoor evaporator coil that has frozen solid into a block of ice due to low refrigerant or dirty coils, which completely blocks air passage. Furthermore, a failing blower motor capacitor or slipping belt can reduce fan RPMs. You can troubleshoot by inspecting your air filter and checking for ice on the indoor unit. You can verify that the problem is fixed when replacing filters or thawing coils restores normal, powerful airflow.
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