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Most likely the resister is burnt out. When you use less than full blower, the blower
speed switch shunts the 12v power though a resister to drop the voltage to the
blower motor, slowing the blower speed. When the multi-speed resister is burnt out,
it is, 'open circuited'. So no electricity can pass though to the blower. When the blower switch is on 'full', the resister is bypassed, allowing full power to the fan motor for maximum speed.
It should be located under that dashboard in most vehicles. Just trace the wires from the
switch to the resister.
Warning: a working resister can get very hot when power is going though it.
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Heater motor only works on high speed in 2001 ford ranger?
Normally when a heater blower motor only works on the High setting, it is caused by a defective Blower Motor Resistor Pack. The fix is to, Replace it. In very rare instances it can also be a defective blower motor speed control switch, but rarely.
I have a 2004 Chevy Colorado blower motor only works on high speed only?
Probably your blower motor speed resister is burned out.
What is wrong when the heater AC blower motor only works on one speed Ford Explorer?
The blower motor works on only one speed. The blower motor resitor pack is defective and needs to be replaced. It is located on the blower housing in the engine compartment just below the blower motor.
What would cause your blower motor to work on only one speed on a 97 Chevy k1500?
If the one speed it works on is high speed, it is the blower motor speed resisitor that is bad.
How do you fix the blower motor switch that only works on high on a 2001 dodge durango?
The blower motor speed resistor is burned out.
Heater only works on high?
The blower motor speed resistor is burned out.
The blower motor on your 1990 ford aerostar seems like it only works when it is on max ac how can you get it to work on the other selectionsshould you replace the blower motor or is there a wayto test?
If you are saying that the blower motor only works on the high speed setting, then the Blower Motor Resistor is defective and needs replacing.
How do you tell if a blower motor relay is bad?
99% of the time, the blower motor relay, or resistor block,will be bad if the fan motor only works on high speed.
Heater fan switch works only on the highest setting?
The blower motor speed resistor is burned out. You can replace only the resistor but the resistor probably burned out because the blower motor is going bad. If you want to fix it for good, replace both the blower motor and blower motor speed resistor.
What is wrong if your blower fan motor only works on high speed on a 2002 Chevy suburban?
blower resistor is bad
1999 Ford Ranger Air Conditioning fan speed switch only blows air on max ac Is this a switch or fan motor problem?
If you are saying the blower motor only works on the high speed setting, then the problem is a bad HVAC Resistor Pack.
Why Fan works only on high speed?
More than likely the blower motor speed resistor is burned out.
