Question about 1999 GMC Jimmy

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The blower motor for the heater is pouched i used to work by tapping nothing.what to do?

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  • kristinechap Dec 30, 2010

    problem solved thx



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Buy a new blower motor, the brushes are toast in the one thats in ur truck, good luck

Posted on Dec 31, 2010


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Probably a blowers motor. Check fuses, voltage at blowers motor. If you can get to the motor, tap on it with a screwdriver handle. It may kick on. If it does come on it still needs replaced.

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First check the fuse for the blower motor in the fuse panel if it is blown replace it and see if blower works.If still not working you will need to buy a test light from your local auto parts store and check for voltage at the blower motor red wire if the test light shows voltage you might have a bad blower motor. There's a trick to test the motor called the tap test start the car and turn the heater fan on high using a mid size screw driver tap on the blower motor and see if it comes on if it does you need a new motor.

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Could be a bad connection or the blower motor going bad, next time it does it, tap on the blower motor, if it comes on, check the connection, if good replace blower motor, hope this was very helpful.

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I would check the blower motor fuse first. If that's all fine, than check at the blower motor connector (behind the glove box). unplug the connector (white connector with 2 wires red and black I think) and unplug it. Turn the fan control ON. Get a DVOM (digital volt meter) or just a plain old analog meter and check across the connector. You should have some reading, while you are using the blower controls by the radio. The faster you wabt the blower motor to go the more voltage there willl be on the meter and vise versa. So in other words on full HIGH the meter should read about 12V. On LOW the meter will be down to 6V or so. The speed adjustment of the blower motor gets done by the "blower motor resistor" and the controler by the radio. Anyways, let me know what you find as far as the voltage goes at the blower motor. OR you can just turn on the control on high and tap the motor with something solid (hammer) and see if it comes on. I have a feeling that it will.

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