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I have a 1999 Nissan Sentra that the heater and A/C fan only blows on setting number 4. The fan does not work on setting 1, 2, 3, only setting 4. I figured I would ask you before I took it to my shop for them to fix it. I want to find out if this is a serious problem.

The problem does not sound like a major problem at all. Let me tell you what I think this problem MIGHT be! I suspect the fan blower motor resistor has died and gone to heaven. Let me explain; when you turn the fan switch to setting 4 you are bypassing the fan resistor block. Setting 4 is full battery voltage. The other three setting use lower voltage to get slower speeds from your fan. That is the purpose of the fan resistor is to cut the voltage down so that you have variable fan speeds. Please let your repair shop look into this problem, just make sure that the fan switch is not faulty or you don’t have other problems which MAY have similar symptoms.

 

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