If coil froze thats a problem , most likely you are low on r/22. Or 410a gas . Also can be air flow problem but all you can check is you’re air filter. Or if you have more than one thermostat a zone damper may be broke. The only way to see is put gauges on unit and check the temps and pressures to see what the problem . If air flow problem most times will freeze whole coil hope this helps
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