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Normally the a/c request signal, you pushing the button to turn on a/c, is detected by the ECM; the ECM then determines that the compressor loads the engine down and bumps up the idle rpm while simultaneously turning on the cooling fan. Turning on the a/c is usually accompanied by the fan turning on since condenser heat flows back into the radiator. Without the fan running there's a risk of overheating the cooling system. You already noticed the a/c becomes warm at a stop but cool when driving. No fan running now allows the a/c to overheat, driving pressures higher than normal and will be detected by the system and turn off the a/c until pressures subside before allowing a/c to run again. This is a protective measure to prevent blowing up the system from excessive high pressures generated on the hottest/humid days of the year or if the cooling fan fails - cycling the system on and off. Replacing the fan or repairing the fan wiring should allow the fan to run continuously when the a/c is running.
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