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Check to make sure the fans are running and the fuses are good for the fans.
There should be two fans, but they are right next to each other behind the radiator/condensor. Are you positive that the compressor is engaging?
Ok,, if the compressor is engaging that tells you that the system is charged enough to run. If the fan starts running when you turn the AC on that also tells you that the system is working properly. If both of those things happen, one of the AC lines should be hot, and the other should be extremely cold. This tells you that the system is actually doing what it is supposed to do. If this is not the case, then you are looking at something else such as an air mix door inside the vehicle.
If the cabin air filter was clogged it would restrict the air flow but it would not cause the AC to blow warm air.
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