[BNaylor]

There are various vacuum/electrical actuators and temperature actuator(s). Is that sound hissing like a vacuum leak or a motor type whirring sound?

I don't know if it is normal to get those sounds for that long of a period of time but it is not uncommon to hear the temperature actuator(s). They will adjust and move depending on where the temperature is set on the climate control system. Dual climate control systems may be a little noisier because there are two temperature actuators. One (driver's) left of the dash center area and one right for the passenger side.