Check fuses first if it is not working at all, if it is still working on high speed only, it will be the resistor which is located just in from the firewall at the back of the heater duct between the fan ( in the passengers footwell) and the heater unit in the centre of the dash. The resistor in some nissans is a "credit card" type usually located by two screws from underneath. Follow the wires from the fan unit to find it.
Remove and replace.
They are not easy to get to on some Nissans so you may want to pre book your Chiropractor!!
Good luck
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