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The thermostat controls the discharge temperature by using the compressor to cool and mixing hot water from the engine to match the setting. When you select AC, it enables the compressor to run from the thermostat. Else, only outdoor air is available.
Could be the IAC(Idle air control valve). It could also be related to the IAT(Intake Air Temperature) sensor. The IAC should be in the throttle body and the IAT in the intake manifold.
AC will not work with temps are cold even when it is turned on. The air is colder cause the temp is colder. The AC cycles in hot weather because the AC charge is low and needs recharging. You will know this if you open the hood run the AC and you will hear the clicking sound of the AC compressor magnetic clutch. You can recharge it easily buy buying a compatible can of refrigerant. I suggest buying the kit with the gage so you don't overcharge the system which will cause freeze ups
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