The heater fan will not turn off, it is going full speed all the time how do i repair this?
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2003 Infiniti QX4 Question: the heater fan wont turn off how do i repair it?
Bret Bodas from RepairPal Test Shop, June 09, 2010, 09:50Master
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.
Answer #2Visitor, November 24, 2010, 06:28
You need to replace the heater blower motor resister.