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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.
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Heater fan works sometimes?
Not knowing what year, make and model you have, I would suspect the heater fan switch and or electrical plug to the switch is at fault.
What could be wrong if the front defroster and AC on a 1991 Chevy Corsica are not working and it seems to be the blower motor because when you turn the setting to heat it works?
Replace your heater selector switch
How does thermostat in heater works?
Cycles it on and off based on attached thermometer setting
Why does blower for ac heat works on only on highest setting for a 2001 Toyota Highlander?
Sounds very much like the speed switch may be faulty, or the ocntacts need cleaning.
Why does your heater ac fan only work on high all of a sudden 92 S10 Blazer?
sounds like the resistor board has blown, on the highest setting it has no resistors, hence the reason it still works
2001 dodge 1500 ac and heater flow regulator switch does not work. works only on defrost?
2001 dodge ram 1500 ac and heater flow regulator switch does not work. works only on defrost. How to fix?
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.
Hot water heater pilot light works heater wont light?
Have you turned the control from Pilot to On? Have you increased the temperature setting?
Why will the heater in a 1996 Grand Am with 4 pos heater switch not work on HIGH but it works in all 3 other positions?
Your heater switch may not need to be replaced. The heater high position is controlled by a fuse under the hood. Until you find the fuse and replace it, your new switch will not work. JRR.
What is wrong if the only air condition setting that works is high4 1-3 doesnt even blowand the AC light doesnt come on It will only blow on the highest setting Any Ideas?
You may have a faulty switch that controls the speeds on the a/c blower fan.
What would cause the heater fan rear defroster to not work on a 1991 Chevy caprice the heater fan only works on the highest setting?
If the heater fan on your 1991 Caprice only works on "High" the problem is more than likely the resister assembly in your blower circuit or poor connections at the resister assembly. When the switch is in the "high" position the current does not flow through the resister assembly it flows directly to the coil of the blower relay. When the switch is in "low", "medium 1", or "medium 2" position the current flows through 1, 2, or all 3 of the resistors in the resistor assembly which results in the 3 different lower speeds. Check the resister assembly and replace if needed.
How come ive changed your heater blower it works but anly blows verry little heat on any setting in a 1992 thunderbird?
probably the heater core is plugged
