When your HVAC system produces heat successfully during winter but fails to blow cold air when switched to cooling mode in summer, it points to specific summertime operational failures. A frequent culprit is a dirty or clogged outdoor condenser coil, which prevents heat from releasing outside, or a dirty indoor air filter that restricts airflow across the evaporator coil and causes it to freeze solid into a block of ice. Another major cause is a failed run capacitor or faulty compressor contactor that prevents the outdoor compressor motor from engaging even while the indoor fan spins. Additionally, low refrigerant levels from a leak will severely impair the system's cooling capacity. You can troubleshoot basic items by checking and replacing dirty air filters and clearing debris from around the outdoor unit. You can verify resolution when crisp, cool air resumes.
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