Question about 1999 Hyundai Sonata

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Blower motor 1999 hyundai sonata, V6 Blower motor works fine, pulled it and check amps, and fuses. Issue is, sometimes it will come on when I turn the knob, and sometimes it will not. It goes in streaks. Will work for days, then not for days. Weird thing is, sometimes when I go over railroad tracks, with the bumping, it will come on! So it's an all or none issue, which sounds like some sort of short somewhere to me.

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  • mwork Apr 13, 2009

    Thanks for the quick response. I have removed and checked the connections to the motor itself already, with no improvement.

    The resistor is right there with the blower motor right? I think I checked that alread as well.

    Now the blower motor switch...not sure about. I have checked the relays(?) under the hood, with no loose connections. This is new ground for me...where is that located to check the connectin at? Thanks so much for being smart in this.

  • mwork Apr 13, 2009

    Thanks so much for your assistance. I will be trying the switch when I have the opportunity to tear the dash up. Will be glad to post what I find out

    Any recommendations on where to start on getting to the switch?

  • mwork Apr 14, 2009

    Ok...last night took the time after researching a little to attempt to get to the switch. Had some success pulling out the WHOLE console there in the middle, from the vents at the top to under the radio, however I did not have any luck getting the whole thing to detach OR to get the bezel over the switch to come off, although it looks like it is a seperate piece when you look at it from the side.

    But I was able to look back at least at the plug in of the switch, and was able to get a screw driver back to it enough to push it to make sure it was connected soundly, and it "seemed" as if it was connected securely. Not sure if a "loose connection" is the problem right now. I suppose it seems like there is a short somewhere for it to come on when I would go over the RR tracks. I will work some more on it tonight, but this time will head to the fan itself again to check connections AGAIN.

    Any suggestions after this rambling?



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Sounds like an "open circut to me. check for loose connections at the blower motor, blower motor resistor, and blower motor switch, you may have to tap each one several times to produce the railroad effect

Posted on Apr 13, 2009

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  • Jeff Hammack
    Jeff Hammack Apr 13, 2009

    the switch location is right where it is at in the dash the connector is on the back side, you will probably have to remove some dash parts to access it, manufacturers are so clever with screws and clips these days, alot of the control station dash bezels pull off, but you should check a Haynes or Chilton repair manual for your specfic car to be for sure.

    yes the resistor is next to the blower motor, and Thanks for the Rating! let me know what you find, please.

  • Jeff Hammack
    Jeff Hammack Apr 13, 2009

    right at its location, anything that looks like its holding the switch in the dash, ie. trim bezel around switches for environmental controls, dashes come apart in layers front to back. I do not own a Hyundai, but my dash has a bezel with two a/c outlets in it around my controls and I can just pull it straight out, then I see the screws holding the panel in.

  • Jeff Hammack
    Jeff Hammack Apr 15, 2009

    yes, when you go to the blower motor itself make sure you tap the actual motor, there is the possibility that the brushes are getting stuck and not making good contact


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Are you talking aboutthe air con and teh fan switch? We had same problem in that it would and wouldn't work, when it felt like it, going left turns made it come on or rightturns or bumos turned it off. Because the air con switch relay is connected to the fan we bitthe expensive bullet and replayed teh aircon controller and it works fine now. Exccept thathe engien turns itself off for no apparent reason. But that';s anothr problem. Goood luck

Posted on Apr 14, 2009


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