Heater fan only works on high

Question edited for clarity.
Question moved to model category.

'95-'99 Nissan Sentra Fuse Box Diagram

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Oct 27, 2018 - Fuse Panel Diagram Nissan Sentra Base, XE, GXE, SE and GLE (B14; 1995, 1996, 1997, 1998, 1999)

THAT CAR HAS AC / HEATER MOTOR FAN SPEED RESISTOR YOU NEED TO REPLACE THAT PART. YOU CAN EASY FIND HELP AT YOUTUBE ABOUT YOUR ISSUE . GOOD LUCK

There is probably a bad wire to the fan or a fuse has blown. use test light and probe wires with key on and see if power, BE CAREFUL FAN CAN COME ON WHEN KEY IS IN ON POSITON. Is car over heating? it usually has to get really hot for the fan to work. try letting car run while in park and watch for fan to activate. Good Luck

A code P0155 may mean that one or more of the following has happened:

• O2 Heater element resistance is high
• Internal short or open in the heater element
• O2 heater circuit wiring high resistance
• open or short to ground in the wiring harness

Replacement resistor goes in heater box under Passengers side dash close to floor grab a manual best 20 bucks you can invest.Have to remove a panel or two and maybe the glovebox.

did you install the right resistor, or the resistor is defective, many problems with aftermarket resistors, try a dealer resistor.

you need blower motor resistor

The most likely cause is the blower motor resistor went bad. The resistor is usually located near the blower motor housing under the hood, it has an electrical connector plugged into it. They are relatively cheap and easy to replace.

I had the same prblem. There is a relay next to the heater blower that needs to be replaced.

Have you checked the fuse . If it's not the fuse then check the fan speed resistor? If the resistor is partially burnt out, you should still have at least one other fan speed. ( In my case I had only the high speed.) The resistor is mounted on the Air box and where the fan wire is connected to. Its behind the glove box and easy to find. Remove the glove box by undoing two hinge pins. Rotate the hinge pins upwards and slide them out. The glove box will drop out and you have access to the resistor. Unplug the wiring connector from the resistor and using a multi tester check the continuity. Replace resistor if faulty. Hope it works for you.