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Nissan Navara D40 Spanish built models with VIN# starting with VSK.
Nissan Pathfinder R51 Spanish built models with VIN# starting with VSK up to 2010
If your Heater fan will only work at One speed.
There is a good chance that it is the Fan Resistor, mounted into the side of the Heater Box
And is Easily Accessible from Under the Glove Box.