The 1999 Nissan Sentra has a blower resistor in the air vents. This mechanism regulates the amount of air entering the cabin.
to the right of the gas peddal
They are generally found close to the blower motor.
Defective blower motor resistor pack.
One can replace blower motor resistor on 2003 Nissan altima by removing the old using spanners and replacing it with a new one.
you need a new blower motor resistor
Locate the resistor under the dash attached on the blower motor housing. Disconnect the wire harness connector. Remove the resistor and install a new one.
Blower resistor switch
More than likely the blower motor speed resistor burned out.
You need to replace the blower motor resistor located near the glove box.
To change the blower motor resistor in a 2002 Nissan Maxima, locate the blower motor resistor under the glove compartment on the passenger side of the vehicle. There is a clip that is depressed and then the resistor will slide out. Remove both ends of the resistor and then replace with the new resistor.
Under the dash on the passenger side. There are two screws to remove it, and the replacement goes right in. It took me about 30 seconds to replace it once I located it