Q: Hi, My car Nissan Sentra 2000. When I rotate the Fan control dial for AC and Heat, it works only for speed 4. For speed 1, 2 or 3 nothing is happening. Thanks! Vald
A: There is a resistor pack either on the blower switch or mounted to the blower motor that is bad, it could also be a bad connection at the resistor pack. Your blower works on setting 4 because when you use this setting you are sending full voltage to your blower motor instead of through the resistor pack. The resistor pack drops the voltage in steps this is what slows your motor down. Should be easy to fix once you locate the resistor pack.