Well, you need a new blower motor. You have maybe just a few brushes broke or badly worn so it still tries to operate. Brushes are worn/broken so the weight of the motor with squirrel cage up prevents rotation but, on it's side there's less weight so it's able to turn. I had the same problem --I have owned my 95 Nissan Sentra for almost 14 years at 246,000 it is still the most dependable vehicle I have owned.
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Hi Heather,sounds like your blower motor resister is bad,that's one of the signs that it's bad,running on one speed,if relay were back,it would run always or not at all.It is located next to the bolwer motor,2 screws hold it on,just remove them with a phillips screwdriver and first disconnect electrical connector from it.Here's where the blower motor is.Here's the resister.
unfortunatelly i have seen this several times, where mice get inside of the heater assemblies and duck work and blower motor. it does happen more with cars that are in garages. in your case/nissan sentra, you have to remove dash board assembly to access blower motor. that is a poor design on nissan part. the fact that you have a mouse or chipmunk in there is not nissan defect. we had people actually call their insurance company to get it covered/repaired and they do it. i have seen whole chipmunk families inside the blower motor cage, with little ones still alive. good luck.
The most likely cause is the blower motor resistor went bad. The resistor is usually located near the blower motor housing under the hood, it has an electrical connector plugged into it. They are relatively cheap and easy to replace.
I enjoyed the same problem on my 2001 Nissan Sentra three months after
I moved to Florida from New England. It is not a fuse; the fan would not work at all if it was a fuse. Your problem is the fan motor
resistor behind the glove box. The classic symptoms are that the fan
will not operate except on 4 (full speed). You technically could
replace it on your own but I took it to my Nissan dealer and had it
replaced for under $100, parts, labour, tax, and coffee.