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Compressor is most likely fine, sounds like the A/C fan is your issue. Turn the A/C on and check to see if the radiator fan is running. If it is not, check the fuse for the fans, if the fuse is ok, have someone listen for the relay clicking on. If you hear a relay click when the A/C is running, you probably have a bad fan motor. If there is no air blowing over the A/C condenser then the air will blow warm, this is why it blows cold when driving but not when stopped if the fan is not running.
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