The heater blower motor may only work on the high speed setting. Our technicians recommend replacing the heater blower motor and fan control amplifier to address this problem.Google+
Car Problem Reports
Infiniti QX4 The Heater Blower Motor May Only Work on the High Speed Setting
Infiniti QX4 Problem
Average Mileage: 141,539 mi (60,000 mi - 247,756 mi)
Visitor, 2002 Infiniti QX4, 163,400 mi
Blower motor ran on max speed and could not change it. Replaced blower motto resistor and worked normal
Visitor, 2002 Infiniti QX4, 247,756 mi
Just in the past couple days my heater fan not working at all it didn't work one day the next day it did & now its not working
at all ..... I'm assuming it needs to be replaced.....
Visitor, 2001 Infiniti QX4, 95,000 mi
Fan/blower stuck on high setting, will not turn off. Have heard I can replace blower motor to fix problem, will try.