i have a 2012 nissan sentra with no heat or air

[hastonandrew2]

hey guys I have a 2012 Nissan sentra special edition. and I was hearing a rubbing when I turned on the motor. and I would turn it off and on and off then on again and it seemed like it quit. it would do this every now and then. and I think the last Wednesday I think the motor went but not sure. I am not hearing the motor kick on at all now when I turn on the motor. I don’t know if it’s the blower motor resistor. or if it’s the motor itelf that stopped working. please guys. any help would be appreciated. thanks Andrew. I can try to give you guys info the best I can thanks.

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[Richard Kirshy]

First thing would be check the fuse.
Second, it is common that when the blower resistor fails, you only have 2 settings that function off and high.
You state: ” I was hearing a rubbing when I turned on the motor ”
If this is the case a blown fuse, blown resistor or burnt out blower motor is quite possible.
Checking the fuse is easy.
Testing the blower resistor, depending where it is located, shouldn’t be too difficult.
You want to check to see if voltage is going to the resistor and coming out on all legs.
Testing the blower motor itself is a matter of disconnecting the plug and testing for a dead short or open on its winding.

Two other possibilities
You have something jamming the fan cage preventing the fan from turning.
In which case you’ll need to remove the blower and inspect it and the duct work for debris.

A faulty fan switch.

[hastonandrew2]

thanks bud. we have checked the fuses in the engine bay and in the car. they all were good. and to test the resister do I test it with it unplugged or can I test it by sticking my prong through the back? any help is appreciated. thanks.

[Richard Kirshy]

Safest way would be to unplug it and look for an open from the common power to the selected speed leg.
But you can also do it when plugged in.
Attach the NEG of you DVOM to chassis ground then with the meter set to DC volts and with the speed select switched to max, check the common input leg of the blower resistor for 12VDC, then check the output legs for each speed setting.

[hastonandrew2]

okay I will try that. and I will get back to you after I try it thanks bud.

[Billy]

FWIW, there’s a good chance you’ll need to replace both the fan and the resistor. Common path of failure is the fan goes bad and in the course of making those rubbing noises you heard pulls a bunch of current, burning out the resistor.

[Author]

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