If your Blower motor(Fan, heater/air switch) Only works on "High" your problem is a Blower Motor Resistor is shot... Good news is,it's a easy fix, "Less than 10 minutes"... Cost for the part at Napa was $25.00 plus tax... Probably cost less than a dollar to make in China.. Oh! Well!!

Look under the Glove Box you will see a 4 wire connector pluged in (straight up) Can't miss it, only wire there..Just on plug the connector,remove the 2 philips screws and it will drop out.. install a new one and you are back in business....There is a link to a Picture of a Resistor below if it works..

This fix was for a 1993 Nissan Sentra XE 1.6 with AC.. I'am sure other year Nissan are similar... Good Luck!! ......ike





http://partimages2.genpt.com/partimages/273991.jpg