Starting Air Flow Control
WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.
When blower fan motor is activated, A/C auto amp. changes the voltage to the power transistor gate, and gradually increases the voltage to the blower fan motor, in order to prevent a sudden increase in discharge air flow (approximately 10.5 seconds for air flow to reach HI from LOW).
NOTE:
When outlet is DEF, air flow control at actuator start is not performed.