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I figured as much but I though I would ask the experts!!!

chris109, "last settings" just doesn't work on  my '14 I guess. I've tried the setting several times - just doesn't work.

I just purchased this 2016 MKZ Hybrid and had to take it back to the dealership as they didnt' change the oil and such.  I had driven the car for about 4 days prior with mute on so i could listen to the engine and used to the sounds it makes (prior vehicle was Chrysler 300 - loved that car).  All was fine.  Pick up car last night go home, start car this morning and as i'm backing out i hear a slight whirring/buzzing sound VERY LOW and it comes on for approx. 10-15 seconds, goes off and back - like something is cycling.  Since dealership messed with all my settings I turned off heating/ac - still heard the sound, so that's not it.  turned off ECO mode, that's not it, was already on MUTE, just not sure what it could be.   This is my first hybrid so i was diligent in listening to the engine those first few days of driving - i could't tell when the Elec came on or switched to Gas, it was that quiet...now i sort of feel it.   UGH - i hate dealeships so bad, i've had nothing but bad outcomes at every dealership service shop i've ever gone to - so maybe it's just ME thinking they did something, but I do know that the sound was not there before, and if the music is on nobody would even notice.  Just checking to see i anyone knows that this is normal or not. 

Not sure if this is to what you were referring.   Last Settings You can set the climate control to operate using the last climate control settings through the information display setting: Remote Start > Climate Control > Heater–A/C > Last Settings. The climate control system automatically uses the settings last selected before turning off the vehicle   Automatic Settings You can set the climate control to operate in AUTO mode through the information display setting: Remote Start > Climate Control > Heater-A/C > Auto. The climate control system automatically sets the interior temperature to 72°F (22°C). In cold weather, the system is set to 72°F (22°C). The heated seats and heated steering wheel are set to high (if available, and selected to AUTO in the information display). The rear defroster and heated mirrors automatically turn on.

On my 2017, I set the auto temp to 'med'.  I remote start the car and let it run for 10-15 minutes.  Nice and toasty when I get in.  But, when I 'start' the car, seat is heated to 3 lights, and steering wheel heat is 'on'.  There are times where I purposely shut those 2 things off when I head in for the night, but they seem to go back to full when I physically start the car.  I am assuming this happens because I have the auto feature on.  Maybe this happens with certain auto settings. As an aside, every once in a while, if the car is left facing the sun or I have been driving a while and the interior is all warmed up, when I restart after a short amount of time, the a/c for the seats engages.  Rare, but it happens.