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keep in mind, doing this MAY or may not trigger a SES due to the compressor not running when the PCM is expecting it to.
IMO, the better(though much more involved on some vehicles) option would be to intercept the signal that the HVAC module sends to the PCM to indicate that the compressor should be running. some vehicles, this can be done by opening the circuit with a rocker/toggle switch. your HVAC module will still command the blend door(s) and routing door(s) to where you set them to, but the PCM won't try to turn the compressor on.
i have no idea how a 2013 toyota's HVAC module handles the compressor request though, probably over a datastream if i had to guess.
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