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there are probably a dozen or more things that can cause AC not to blow cold
the most common would be a leak in the system that has allowed the refrigerant to leak out, or a failed heater valve
other possibilities would be a failed compressor or compressor clutch, any of several sensors having failed or a failure of the control computer
as next steps, you should have the refrigerant level checked and also the faults and inputs/outputs read and monitored from the climate control system.
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