Hello, recently I discovered the blower for heat and a/c only work on high speed in my 2002 sentra. From past experience with other cars this is usually caused by faulty resistor block in the blower circuit. I have taken the passanger kick plate and glove box out to gain access to the blower but have been unable to find anything that resembles a resistor circuit. Any ideas would be greatly appreciated.
Mike

 

i agree that it is the blower motor resistor...i would recommend calling a nissan parts dept, they can tell you where it is..they have lots of pictures of where things like that are located.