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Bad resistor at the blower motor?

Bad blower motor switch?

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โˆ™ 2011-05-14 15:30:33
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Q: Blower motor only runs on high?
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Blower motor only runs on high and only blows hot?

You have 2 problems. First, the blower motor running only on the high speed is caused by a defective blower motor resistor pack. Replace it. Second the fact that it is only putting out hot air indicates the temperature control valve is defective or stuck.


Blower fan only runs in high position for a 1989 Buick Lesabre?

Either the blower motor fan switch is bad or the blower motor resistor pack is defective. It is more than likely the blower motor resistor pack.


Why does a blower motor only work on high?

It's the blower motor resister.A blower motor resistor controls the speed of the fan from low to the 2nd highest by going through a resistor block. The resistance changes on each coil, therefore changing the speed of the blower. high setting bypasses all of the coils and runs at full speed.You know yours has gone bad if it only runs on high.Read more: Operation_of_a_blower_motor_resister


Operation of a blower motor resister?

a blower motor resistor controls the speed of the fan from low to the 2nd highest by going through a resistor block. The resistance changes on each coil, therefore changing the speed of the blower. high setting bypasses all of the coils and runs at full speed. You know yours has gone bad if it only runs on high.


Whats wrong the blower motor runs on all speeds but high on your 2002 Dakota?

Sounds like a bad blower motor resistor block.


Chevy Silverado blower motor runs on high only?

This is typically caused by a bad resistor. Could be the switch itself, but it's usually the resistor.


If you replace the resistor on the blower motor on 96 Jeep Grand Cherokee but still get only high speed or nothing from blower is there another possible cause?

If the fan runs only on high then it is probably the blower motor resistor, and not the blower motor itself. This is pretty standard in any vehicle. It should be located somewhere near the blower motor. --------------------------------------------There are two circuits that power the blower motor. A relay switches between the two different circuits. The high speed circuit suplies battery voltage to the blower. when you set the blower speed switch to any other speed but high the current passes through the other circuit. The blower resistor is in this other circuit. Check the fuse that supplies power to this circuit, check the relay that switches back and forth between the two circuits. Check the switch. Check the wiring. A VOM (volt/ohm meter) is very useful for this type of trouble shooting.


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blower motor relay


What does the blower motor resistor do on a 2001 prism?

The resister for the 2001 prism blower motor drops voltage to the blower motor. This is how the blower motor runs at a lower speed.


Why does your 2000 Ford Ranger ac heater fan switch only run on high speed setting?

What has happened is your blower motor resisor has failed. When you turn the fan speed switch those settings are resistances that "damp" the blower motor and it runs slower. When this fails, it just has full current to the blower motor. Sometimes these are called block resistors. That likely is the problem.


How do you troubleshoot the fan blower motor switch problem on a 1991 Ford F150?

It will be either defective fan switch, motor itself, blower motor resistor pack, blown fuse, or defective wiring. If the blower runs on high but no other speed, suspect the resistor pack.


Why won't my car blow air?

If the blower motor does not function, it is blown fuse, defective blower motor, defective blower motor resistor pack, or in rare instances a defective blower motor speed control switch. Check the fuse. If it is OK, apply 12 volts directly to the blower motor and if it runs, you probably have a defective Resistor Pack. Very common problem. The only fix is to replace it.


Why Heater fan not blowing?

If the blower motor does not function, it is blown fuse, defective blower motor, defective blower motor resistor pack, or in rare instances a defective blower motor speed control switch. Check the fuse. If it is OK, apply 12 volts directly to the blower motor and if it runs, you probably have a defective Resistor Pack. Very common problem. The only fix is to replace it.


2002 Chevy silverado fan blower only runs on speeds 3 4 and 5 where is the relay located?

Its not the relay, it is the blower motor resistor.


Have 12 volts at the blower connector and when you connect 12 volts to the terminals of the blower motor it runs When you plug the blower connector onto terminals of the blower the fan does not run?

If you have 12 volts at the blower, And the blower runs when it is straight wired. The blower switch runs through a resistor that allows the blower to run in low, medium-low, medium-high. Find and check this resistor. Most of the time it is located on the passenger side of the firewall.


Why does 2000 Ford E-series van Blower not work on high speed Runs on lower settings Since high speed fan would not travel through a resistor in the motor resistor block I wonder what else is wrong?

Check the connections on the E-series vans blower resister. The resister and wiring have a bypass to send full voltage to the blower motor. a loose connection here will cause the motor to not run on high.


What makes your fan run very slow 1997 dodge van?

If you are saying it only runs on low speed and will not run on medium or high, then the Blower Motor Resistor Pack is probably defective. Replace it.


Blower motor only runs on high where is the fan relay switch on your 03 silverado?

resistor needs to be replaced it is under the glove box by the cabin filter remove the black round box you will see it


How do you know if a Blower motor ford focus is broken?

Connect the blower motor directly to 12 volts DC. If it runs it is good.


99 Malibu at first the AC blower would only blow on high now not at all it also was making noise just before it died resistor or motor?

Apply 12 volts directly to the motor. If it runs, it is the resistor pack, or the switch. If it doesn't it is the motor. I hope you have checked the fuse.


Blower motor runs with ignition off?

probablly a bad ignition switch or blower motor not sure on that should run without power


Blower doesn't work on 1994 gmc sierra. Where do I start to try to fix it?

Start by checking the fuse. If the fuse is good, apply 12 volts directly to the blower motor. If the motor runs it is good. Check all the wiring for loose or burnt wires. If all this checks out, then the Blower Motor Resistor Pack may be defective, or the blower motor speed switch itself.Start by checking the fuse. If the fuse is good, apply 12 volts directly to the blower motor. If the motor runs it is good. Check all the wiring for loose or burnt wires. If all this checks out, then the Blower Motor Resistor Pack may be defective, or the blower motor speed switch itself.


What might be wrong with the blower in a 1995 Buick LeSabre if you've replaced it the condenser and compressor are fine and fuses are OK?

Does the blower run? Runs only on high?


Why does the heater blower on your 1993 K2500 Suburban work on high speed only and not the lower speeds and where is the relay for this motor located?

These and similar vehicles use a "hi-blow" relay to put the blower motor into high speed. The low speeds are controlled by putting various taps from a limiting resistor into the motor cicuit. The hi-blow relay is not going to be at fault since the motor runs fast. It's possible you have an electronic temperature control that has a defect. Most likely, though, is the resistor is burned out or disconnected. The resistor is usually in the heater blower box so the moving air can keep it cool.


How do you change a blower switch on a 2001 Grand Prix?

it is probley not the blower switch. if your fan runs on 3,4 and 5 it is your blower motor resister.