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12 volt fan

Discussion in 'Electronic Basics' started by kell, Oct 17, 2006.

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  1. kell

    kell Guest

    I have 1986 Suburban with a bad heater blower. I was thinking about
    getting a cheap 12 volt muffin fan. allelectronics has this for $3:

    Nidec Beta V™ TA350DC, Model M35291-35. 12 Vdc, 2.3 Amps. 150 CFM,
    6,000 RPM, 57 bBA ball bearing fan. 92mm square x 38mm thick. Plastic
    frame and impeller. Removed from used equipment, good condition. Four
    leads, 10" long. UL, CE, TUV

    Would it be powerful enough or do I have to look for something better
  2. kell

    kell Guest

    Or this one $18.50

    12VDC 6.75" COOLING FAN

    Comair Rotron "Major™" JQ12ROX. 12 Vdc, 2.26 Amps. 6.75" x 5.92" x
    2." 235 CFM ball bearing cooling fan. Four wires. Fuse and polarity
    protected. Metal housing. Polycarbonate impeller. UL, CSA, CE.

    Or just get several of the three-dollar fans. How many CFM do I need
    to heat a Suburban?
  3. John Fields

    John Fields Guest

  4. Yes. Try a wrecker, eBay or Google for parts.
  5. Martin

    Martin Guest

    I suspect that you will want to repair or replace the original.

    FWIW I had the same problem on a 1982 Toyota Corolla.
    Took the blower apart, and the motor brushes were worn out.

    Toyota Parts did not sell the brushes, just the whole motor for $$$.

    Took the old brushes to a vacum cleaner repair place, and found some
    vacum cleaner motor brushes that were slightly bigger for $2 or $3.

    Bought them and filed them down to fit.

    Installed them, and the blower ran again for years, till I junked the

  6. Dan Akers

    Dan Akers Guest

    The propeller type muffin fan won't be able to deliver the airflow
    necessary for proper operation of the heating/cooling system. The 150
    cfm is almost certainly the open frame rating; ie fan not installed in
    any sort of duct-work. The "squirrel cage" blower that is installed in
    your Suburban is much more robust in terms of air delivery capability
    in combination with the duct-work of the vehicle. Besides; how would
    you install a muffin fan in the vehicle venitlation system?

    Try checking the fan power leads for continuity; if you get continuity
    then the brushes may be good and a bearing may be siezed. If no
    continuity, even when the motor shaft is rotated, then the brushes may
    be worn out or they may be clogged up with dust (I had this happen on
    old Ford LTD I owned years ago; cleaned out the crap and it ran good as
    new.) If the shaft is hard to turn by hand, then usually you can just
    lube the bearings to get things going again. Those motors don't
    typically wipe out the bearings; they simply don't have the torque.
    But the original lube does dry up and turn to a gummy soap-type
    substance over the years and that alone can seize the shaft. Use some
    penetrating oil on the bearings to break them loose, then apply a
    heavier lube to the bearings before reinstallation.

    Dan Akers
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