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Blower motor??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rampage, Feb 3, 2002.

  1. rampage

    rampage 1/2 ton status

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    Hopefully this will be the last of my electrical gremlins for a while. For as long as I can remember whenever I have the heater blower running on full blast, my voltage drops noticably, by about a volt. I'm curious if this is normal or if I possibly have a bad ground/short somewhere. I find it hard to beleive that the blower motor draws that much current. Having my headlight on, running both windows and the rear window doesn't even drop it that much.
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    FWIW, my truck has always done the same thing. The colder it gets outside, the worse it gets. I have replaced both the alternator and the fan motor since I've owned the truck, and the truck still acts the same way.

    I would assume that the fan motor uses a lot more juice then people realize.......



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  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Doesn't the power to the blower motor go through a series of resistors to control fan speed? Maybe that's what causes the draw?

    Rene

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  4. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    Yup. It goes through a variable resistor that controls the low or medium fan speed settings...
    When on high it bypasses the resistors and allows full voltage to the blower motor.
    Don't know about that problem though.

    [Real Men Don't Care About Gas Mileage Or Rapid Tire Wear!]
    1972 K/5
    Ryan B.
     

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