The blower on my 2002 Nissan Quest suddenly stopped working. The blower is good so what else could be the problem?

The main reason is a defective blower resistor. Normally the lower speeds on the fan switch go out first and leaves just the high speed working. Either your resistor is bad, the blower motor itself is dead, or you have a blown fuse - check the fuse box.

The resistor limits power to the blower to make for the slower speeds. It could be a sticking fan relay or the controller.

Replace the "step-down" Resistor, it located inside the vehicle, next to the blower motor.

How sudden? Sounds like blown fuses or a breaker tripped.

pull wire and check voltage that shoud be going to blower motor.

The problem is they blower motor resistor.That will fix your problem.It is located under dash by blower motor after you buy the part look at it and you will find it fast THANKS TIM

Change your blower motor Resistor...it's probaly oxidized on those two coils....

There might be some heavy resistance with one of the wires leading to it. Have an electrician check it out.

Its most likely related. Vehicle speed sensor is bad

try taking a look at the fuses that is the easiest fix