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weird never had that experience with any gm vehicle, i turn it on auto/manual, doesn't matter. when started it blows air it's doesn't "wait" for anything. on auto it may increase/decrease the fan speed to compensate for the desired temp throughout a drive but that's it.
Mine, when cold (and it has been cold here), will blow air on low speed, until the engine warms a bit, then it ramps the fan up and blows warm air...I believe this is the designed implementation...give a little airflow on the windshield so your breath doesn't fog it up...but fan speed definitely increases from low as the engine (coolant, and thus the heater core) warms.
