Xbox Class 150- No Heating Sounds

I don’t seem to hear the heater sounds I know they added it but I can’t hear it ???

 

Isn't there another button to turn the cab heating on and one for changing the intensity?

 

Not to sure??

 

there are 2 switches for heating on the back wall behind the drivers seat, one controls intensity and therefore noise level of it and the other acts as an on/off switch