Determining whether your central air conditioning system has frozen up involves observing distinct physical and performance indicators. Major warning signs include a sudden and complete cessation of cool air blowing from indoor supply vents, thick white frost or solid ice encasing the insulated copper suction line outside your home, water pooling heavily on the floor around the base of the indoor air handler as accumulated ice melts and overflows the drain pan, and a system that runs continuously without ever satisfying the thermostat setting. Verification: Open the indoor air handler access panel or inspect copper lines near the furnace for visible frost.
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