Nearly all air conditioner freeze ups are caused by either a lack of refrigerant, or a lack of air flow to the evaporator coils. If your air conditioner is freezing up, the first thing you should do is turn it off. If you continue to run it, the compressor could be damaged. It's best to call Climate Control!
I agree often times it’s a leak but I recommend checking the AirFiler First. A really dirty filter can freeze up a system.
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