Resistors control the speed of the AC/Heater fan. These resistors are switched on and off in various combinations to create the different fan speeds. When the resistors burn out your fan will only work on the "HI" setting. The "HI" setting doesn't use any of the resistors and that's why it works. These resistors are near the blower and the blower is beneath the dashboard on the pasenger side. Just have to located resistors now.
The fan control module in the engine compartment has gone bad.
try replacing the blower motor resistor
Defective Heater Resistor Pack.
Check the low speed relay and the resistor at the motor
You most like have a bad blower motor resister.......
Heater is not working in a 2002 ford foucs only work when fan setting is place in?
try replaceing the switch that controls the low to high for heater It's gonna be the blower motor resistor (near the blower motor).
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
Defective heater resistor pack.
heater resister is bad
Odds are you need a fan switch, It is very common for the high on GM fan switches to go out.
The most common cause is a failed blower motor resistor.
There is a resistor pack operated by the fan switch. It has failed. You need to replace it.
Bad resistor pack on blower motor? Bad switch?
do you mean the speed of the fan? if so, it'a relay generaly near the motor of the fan. If it's the heat who only came at high speed, you need to add some antifreeze.
Yes there is, but it only operates the high speed function.
Switch problem? Cables disconnected?
If you mean the fan - replace the fan speed resistor if the fan only works on high speed. Please supply more information - no heat or cooling? Does fan work? Does mode switch work?
The blower motor resistor pack is bad.
Can't get my heater to work on my 156
It is the resistor, replace it.
Blower motor resistor defective
YOUR BLOWER RESISTER IS BAD
My 1994 did the same thing.....the problem was in the high/low switch....
A broken fan heater can not work and A FORD Foucs does not run