Yes, the default fan speed setting is speed number 2, assuming you have a B, L, or S model 164. It sits there unless the hvac computer decides that the cabin temperature is too far away from the selected hvac temperature. It is rare to see the fan setting drop to 1, usually rising to 3 or 4 for a while. By changing the selected cabin temperature, you can check what the fan is doing, the speed changing as you change that desired cabin temperature.
As pinino mentions, you turn off the system by pushing the off button on the far right. Push it again to turn the system back on.
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6