98 sentra - fan problem

the a/c-heater fan on my '98 sentra only works on setting 4. on setting 1 thru' 3, the fan doesn't even blow. on 4, it blows full force. I assume it is the switch? anyone know how to access this switch or has had similar problems? thanks

yeah, my sisters 97 sentra does the same thing, only work on 4, no idea how to fix it though

Had this problem and solved it.

There is a resistor assembly mounted on the air duct close to the
blower motor. That part has failed. It is used to control fan speeds
1, 2, and 3. Speed 4 is the maximum blower motor speed, so no
resistors are involved. Replacing the resistor assembly is something
the home mechanic can do. The only tool needed is a Phillips
screwdriver. The replacement part costs about US$25.

The blower motor is located just above the passenger's feet. Look at
the wires leading away from the blower motor. Just inches away from
the blower motor there is an electrical connector located on the air
duct. That's the resistor assembly. It is easy to remove and replace.

Replacement is the usual remedy. However, if a spot of localized
damage is seen it may be repaired with a soldering gun.

There is a good photo of the blower motor and resistor assembly in the
Haynes repair manual, page 3-8. If you don't already have a copy of
this book, please get one. It will be money well spent.

a) Move the front pass seat all the way back (for convenience)
b) Remove a harness connector (with 4 wires I think) running into the
bottom of the blower motor.
c) Remove the 2 philips screws that hold the blower motor resistor in
place.
d) Put new one in, reverse install.

Blower Motor Resistor Part Number: 27150-1E405

You can get it here:

http://www.nissanparts.cc/cart/?pn=27150-1E405

Should be $28 at your local dealer. It's $28 delivered from discount
Nissan parts sites


Good luck.

Yeah, I found I had the same problem when I bought my 98, and Darkwing didn't miss a beat there. Its cheap and relatively easy to install. Good luck with that.