Blower Motors for Nissan Sentra
The blower motor for Nissan Sentra is a centripetal motor connected to a cage fan that provides forced air to the heating, ventilation, and air conditioning (HVAC) system. The blower motor in the compact Nissan Sentra is housed in an HVAC box just behind the dash. The air generated by the blower motor is used to circulate hot or cold air through vents in the passenger cabin.
How often does the blower motor need replacement?When the Nissan sedans heater is engaged through the climate controls, a manifold directs the air flow generated by the blower fan over the heater core to draw heat from the engine coolant. When the A/C is engaged in the Nissan Sentra, the air is directed to the refrigerant-cooled evaporator core to draw heat and humidity out of the air as it circulates between the HVAC system and the cabin. Although a failing blower motor may not prevent the Nissan from driving safely, replacing this part will ensure you and your passengers enjoy a comfortable ride regardless of the elements on the road ahead.
Vehicles with high mileage experience more frequent blower motor failures. As the Sentras blower motor ages over time, parts of the motor and fan can start to wear and tend to break. Regardless of the age or mileage of your Sentra, the buildup of dust and debris in the HVAC box can cause the motor to seize or wear on the bearings. The Nissans blower motor receives power through a connector to the electrical circuits connected to the battery. The electrical circuit to the Sentras blower motor is also wired to a resistor that adjusts the flow of current in order to control the speed of the airflow from the fan. Any obstructions in the HVAC ducts that require the blower motor to continuously work harder can increase the flow of current through the power connector and resistor. Due to the high amount of current, it is possible for the Nissans resistor or the power connector to get too hot and melt. Cleaning the air inlets, air filters, and vents in your Nissan Sentra vehicle can extend the life of these motors and prevent larger HVAC issues.
How is a faulty blower motor diagnosed on the Nissan?If there is a noticeable decrease in the air pressure at the vents of your Nissan Sentra vehicle even at high fan speeds, the blower motor may be failing. When the bearing on the blower motor begins to wear, a squeaking or grinding sound might be heard from behind the dash on the passenger side of the Sentra. Rattling from the same area can indicate broken fan blades. If the air-circulating fan only works on the highest setting, the motor blower resistor is likely burnt due to high current demand. If this occurs, any related fuses should be checked first, and then the Nissans blower motor’s electrical connector should be inspected to determine if power is reaching the blower motor. If there is adequate power reaching the Sentras blower motor, the motor can be hooked to an external power source to see if the sedans motor requires replacement.