GM and GMC

Why would the blower motor on a 95 GMC truck only work on high?

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2005-12-15 03:28:15
2005-12-15 03:28:15

usually what causes that is the blower motor resistor. Get a volt meter and test it according to it's values, 90 percent of the time it's the RESISTOR.

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the resistor for the blower motor is busted blower works on high with out it

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I would suspect the blower motor speed resistor is bad.

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I would suspect the blower motor speed resister is shot.

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Bad resistor at the blower motor? Bad blower motor switch?

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The blower motor resistor pack is defective. Replace it.

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Swap the relay with a known good one, many of the relays are of the same part number. Keep in mind that the blower motor relay only controls the high speed function. The blower motor speed resistor and the blower motor switch controls the lower speeds.

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Only for the high speed blower function. The lower speeds go thru the blower motor speed resister.

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If you only have high speed I would blame the blower speed resister. If you have no speeds and the fuse is good, I would blame the blower motor or the switch.

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The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.

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The blower motor speed resistor is burned out. The resistor is located close to the blower motor and is easy to change. Your local auto parts store will have that part for you.

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Could be,The blower speed switch or electrical plug at switch is burned out. The high speed blower relay is burned out. The blower motor is on its way out. The blower motor speed control resister is burned out, The cabin filter (if applicable) is very dirty.

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The blower motor relay for high speed would be located in the power distribution box under the hood.

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by the blower motor there is a resistor connection, you will find it melted the blower motor is bad. it draws to much power causing the connection to get hot and melt and burn. you will have to change the connector and the blower motor. the blower is still working but its drawing to much power, the motor windings are shorted out inside. disconnect the connector from the resistor and you will see it.

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A blower motor that only works on high is normally caused by a defective Blower Motor Resistor Pack. DRL, do not have a clue.

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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

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truck blower only work on high

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The blower motor resistor has failed.The blower motor resistor has failed.

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If the blower works on slower speeds only I would suspect the high speed blower motor relay (under the hood in the power distribution box) or the switch itself. The blower speed resistor is working if all the slower speeds work.

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When you beat the blower motor, you are probably shaking the blower resister. The resister is what controls the blower speeds and is probably bad or loose.


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