A/C Compressor stays on with A/C and De-Frost mode off

Hey Everyone, I have a 2014 Toyota Tundra 4 x 4 double Cab. When the air blower is on, with A/C off and blower setting knob set to the non-defrost setting, The A/C compressor comes on. Very Cold air is blowing from the blower vents. I took the vehicle to the dealer and they said that the A/C compressor will come on/off regardless if the inside A/C switch is on or in off position. They said the operation is normal.

This does not make sense to have the A/C compressor running while I have the blower temp set to warm air. Also, I thought that the A/C compressor only comes on if the user puts the vehicle in Front window De-Frost mode or turn the A/C on.

 

i have a 2018 and discovered that if my temp knob is turned all the way counterclockwise the AC will stay on. If i turn it one click clockwise the AC can be turned off. not sure if we are talking about the same issue but im new to tundras

 

I've had mine for 11 years and same that is normal operation it is taking the humidity out of the vehicle