Question about 2005 Dodge Ram 2500 Truck

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Why the blower motor does not work when is power presence and the blower motor is new ? also the resistor and the a/c controller are new parts. the firts abnormal thing the I did notice was the a/c compressor light come on even when the blower speed selector was at off position. I did check a similar truck same year and the light never come on when the blower speed selector at off position. Any ideas ? please let me know. Thanks Rafael

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Check for possible bad ground to the blower motor first. Rig yourself up a jumper wire from ground side of battery to the mounting screw on blower motor. Motor should work if you have power to motor.Or motor is bad. The control on dash for a/c problem is in the wiring, go back and check wiring for bad connector plug or wire causing the light to come on. Hope this will help you.

Posted on Jun 07, 2010

Testimonial: "Thank you very much, you are correct, problem fixed, it was a power wire not carried the load, once again thanks. Rafael V."

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Welcome to FIxYa.com



Blower Motor Resistor and Controller Replacement

Image Blower Motor Resistor Or Controller/Power Module Remove/Install

REMOVAL

1. Disconnect and isolate the batten' negative cable.

2. Depress locking tab and unplug the wire harness connector from the blower motor

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3. Depress locking tab and unplug the resistor or controller connector from the blower

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4. Remove the 2 screws that secure the blower motor resistor or controller to the

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leedavidian_45.jpg



Thank you for using FixYa.com

Regards, Lee Davidian

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1 Answer

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If yours is dual zone, I believe the resistor (blower control module) is a solid state. Did you check it using the fan speed selector and test the voltage output on the purple wire?
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When blower motors go bad they will often absorb a lot of electrical current. This current has to go through the blower control/resistor and will often burn them out due to the heat developed from the high current load.
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1 Answer

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