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Q: the heater fan wont turn off how do i repair it? on 2003 Infiniti QX4

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The heater fan will not turn off, it is going full speed all the time how do i repair this?
(2) Answers
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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