Question about 1998 Ford Explorer

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I have power to the blower motor switch but no power to the blower motor

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Before the power reaches the the blower motor it has to pass a rheostat which is usually located behind the glove compartment (usually under $50.) Likely the problem. Also , check your fuses as the blower motor might be fused separately.

Posted on Oct 22, 2013

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In most cases the blower motor brushes are worn down and in some vehicle can be replace.

Posted on Oct 22, 2013

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1 Answer

Blower motor


I'm showing a blower relay and a resistor used on models with manual ac control.
The blower motor is grounded and the fan switch provides power thru the resistor. So you have a 40amp blower fuse that handles high thru the relay, then a 30amp HVAC fuse that powers the blower thru the fan switch.
Do you not have power from the resistor to the blower motor on the purple wire ?

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I have replace the blower switch pigtail rerister still no blower working could it be the relay if it is where is it ? the blower motor and relay are the only two things left to change need help thanks


Do you have power to the blower motor?

With everything connected there should be power on both wires going to the blower motor. If there is no power than remove the blower motor relay in the fuse block under the hood. There should be power at two of the pins and two of the pins should be grounded. One pin is powered by the 50 amp Blower fuse and the other gets its power from the function selector (the switch that controls where the air comes out.

If only one pin has power than pull the 50amp blower fuse If power goes away than you know that the relay is not recieving power from the function selector. That is powered by a 15 amp fuse in the cetral fuse block (under the dash i think). If that fuse is good than check for power at the pink with black wire at the function switch. If there is power there tan check for power at the yellow with red wire and the function switch. If there is no power than you have a bad function switch.

This is a ground side controlled blower motor. The speed switch controls the path to ground. so if there is power to the blower motor on the orange with red wire you can ground the orange with black wire at the blower motor and it should run.

That should be enough info to get you started. Let me know what you find and I'll be happy to help further.

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If the Blower Motor does not operate on any speed, the blower resistor is most likely NOT the problem. To find out if it is the blower motr or the switch, test for power at the blower motor connector. If there is power the blower motor should be replaced. If there is no power, there could be several reasons for this including the blower control switch, the blower motor circuits or even a problem with your ignition switch.

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here is how your system works. The mode switch provides power to the blower relay. With the relay on, 12 volts goes from the relay to the blower motor. The negative power comes thru the resistor and switch (except for Lo, which doesn't go thru the swtich), which also has a thermal fuse. If the 50 amp fuse in the engine compartment is good, the thermal fuse in the resistor is the most likely cause, though switch failure often causes the thermal switch to blow. You should use an ohmmeter to test the switch for multiple continuities. There is no power to the switch except what comes thru the motor and resistor. Please see my tip at http://www.fixya.com/cars/r6234839-doesn_t_heater_or_air_conditioner_blow and let me know if you have questions.

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1 Answer

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