2003 Infiniti QX4 Q&A
2003 Infiniti QX4 Question: the heater fan wont turn off how do i repair it?
These are fairly complex systems, diagnosing this problem is not something you can easily convey in this forum. If you seriously want to diagnose this, get a wiring diagram and a voltmeter and troubleshoot the blower motor circuit. For some reason it is getting full power to the motor, and this may be caused by the blower motor control module or a motor resistor, but until it's diagnosed these are guesses. - Bret Bodas
You need to replace the heater blower motor resister. - Visitor