The heater fan will not turn off, it is going full speed all the time how do i repair this?
the heater fan wont turn off how do i repair it? on 2003 Infiniti QX4
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.
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You need to replace the heater blower motor resister.