Depending On What Vehicle You Have You Probable Have A Blown Heater Motor Resistor. It Will Be Located In The Engine Compartment, Near & In The Housing That The Fan Motor Is In. It Should Have A 3 or 4 Wire Plug In It. Also 3-4 Small Screws Holding It In. Also It Is Kinda Wierd Looking. This May Help.
if it doesnt work on 1 and 2 it could be a blower motor resistor but if it doesnt work at all check the fuses, relay and check voltage if it reads 12 v replace the motor
It should do.
Your blower switch sensor is out. Replace it!Then all the speeds will work
either the blower control switch or the blower motoer needs replacing
truck blower only work on high
When you find out let me know I have same problem replaced blower fan and resisitor did not work. I have a blazer zr2 2002
the blower resistor controls the fan speeds
A blower motor that only works on high is normally caused by a defective Blower Motor Resistor Pack. DRL, do not have a clue.
from what i have read it is the blower motor resistor it goes bad and only lets the fan run on high google blower motor resistor and read on
try wiggling the wires at the blower resistor if don't work then tap on blower motor
it's a problem with the blower motor resistor,
faulty blower motor resistor
blower motor resistor needs to be replaced
When the fan is on high it does not run through the blower motor resistor. The low speeds don't work because the blower motor resistor is bad.
Blown fuse, bad motor, bad blower motor switch, or a defective Blower Motor Resistor Pack.
If the blower motor randomly and intermittenly quits and does not work, chances are good the blower motor itself is faulty, if the blower motor does not work on all fan speeds from low through high, it most likely needs a blower motor resistor.
The blower motor speed resistor is burned out. The high speed function bypasses the resistor. The speed resistor is generally located near to the blower motor.
If the blower works on slower speeds only I would suspect the high speed blower motor relay (under the hood in the power distribution box) or the switch itself. The blower speed resistor is working if all the slower speeds work.
Blower Motor Resistor is bad. 20.00 part at AZ.
replace the blower motor resistor
Resistor or blower motor power module.
Probably a bad blower motor resistor
Most likely a failed blower resistor.
Either your switch is messed up, or more likely the blower motor resistor is bad.