The 1999 Nissan Sentra has a blower resistor in the air vents. This mechanism regulates the amount of air entering the cabin.
They are generally found close to the blower motor.
The Nissan blower motor can be found in the engine compartment on the firewall. The blower motor will be on the passenger side of the firewall.
Check the blower resister and then check the blower motor switch..
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to the right of the gas peddal
Defective blower motor resistor pack.
A bad control switch can cause your 2003 Nissan Sentra heater blower to stay on. The motor or a bad sensor can also cause the heather not to work properly.
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