Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Just to be clear, this is the fan under the hood out at the radiator that won't turn off?
Ok, Does the car have auto climate control where you just set the dial to a certain temp and leave it, or manual where you can adjust it manually from hot to cold?
You have one of two issues happening here. If you have a test light or volt meter, we can figure out which one it is.
Either the blower resister is shorted to ground and always supplying full ground to the fan, OR the fan switch is sending ground to the fan at all times. If it's the second one it's bypassing the resistor and allowing the full 12 volts to get to the blower motor.
This isn't a major problem for a shop to diagnose if you are so inclined, it's definitely a problem in those 2 areas though.
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Give me a moment to look up the wiring diagram and I can tell you what to look for.
Ballpark the fan control amp is about $100, shop would charge about .5 hours labor to replace it.
To test, you have to get under the dash, remove the glove box so you can gain access to it. Then with your meter check for continuity to ground on the blue/white stripped wire. It has to be unplugged at the blower, but the fan control amp has to be plugged in when you check this wiring.
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I haven't heard back from you on this so I was wondering if you need further assistance or is there anything else I can do to help?