Question about 1998 Chevrolet Astro

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My 1998 astro van blower motor only works on high speed.

I changed the heat control assembly but the blower still only works on high speed. is the motor gone bad?

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  • rmarb Feb 27, 2009

    Question. I have the same problem with my heater fan or motor working on high sometimes. Where exaclty is the motor and resister under hood, or inside by the passengers floor board?
    What does the resister look like, and are these parts bought at the junk yard or at a auto parts store?

  • hotterod Mar 13, 2009

    The resistor is located behind the window washer reservoir and the over flow reservoir on the right side just below and to the left of the blower motor. Just follow the blower motor wires right to it. And by the dealer one as it will fit properly. $60?
    It has 2 small screws on either side and hard to reach.

  • Anonymous Mar 16, 2014

    work on one speed

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No the motor is not bad or going bad, the heater blower motor resister is bad, thats regulates the blower speeds, its located under dash by heater motor 2 screws hold in heater box with a electrical plug to it.

Posted on Feb 17, 2009

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I would try replacing the motor to see if that dosent help. its on the passenger sie under the hoog held in by three screws and a plug.takes about half hour to change

Posted on Feb 17, 2009

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What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?


Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
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The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
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