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A/C Fan Speed Knob

Discussion in '2nd Gen. Tacomas (2005-2015)' started by seligman, Jun 12, 2013.

  1. Jun 12, 2013 at 6:29 PM
    #1
    seligman

    seligman [OP] Well-Known Member

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    This past weekend I took a trip with a friend in his 2009 Prerunner Double Cab.

    About 400 miles into the drive, the Air Conditioning Fan Speed Control Knob stopped working in the lower positions. The OFF position worked, and so did the HI position, but nothing in between. The outdoor weather had been 95-105F for the previous few hours.

    I don't remember when, either that night or the next day, the Fan Speed knob was working normal again.

    What gives?

    fanspeed.gif
     
  2. Jun 12, 2013 at 6:39 PM
    #2
    afd23a

    afd23a Well-Known Member

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    The Dynamo of Dixie
    Vehicle:
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    Factory Fog Lights, Removed Secondary Air Filter, Metra Ipod Adapter, Int Wiper Stalk, Wet Okole's, URD Short Shifter, Scanguage II w/Blendmount, Fat Bob's 2.75" spacer lift, ARE topper, SP Performance Pads & Slotted Rotors, 4.10 gears
    The problem is the fan blower motor resistor not the fan speed controls. The resistor is mounted to the firewall near the blower motor. One of the pins in the connector loses connection and then the only speeds that work are off and hi.
     
  3. Jun 12, 2013 at 6:59 PM
    #3
    seligman

    seligman [OP] Well-Known Member

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    What is the fix?
     
  4. Jun 12, 2013 at 8:46 PM
    #4
    Jimmyh

    Jimmyh Well-Known Member

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    Replace the resistor pack and or connector as needed.
     
  5. Jun 12, 2013 at 9:37 PM
    #5
    seligman

    seligman [OP] Well-Known Member

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    What are we talking in price and time if my friend does it himself?
     
  6. Jun 12, 2013 at 9:39 PM
    #6
    Juggernaut

    Juggernaut Captain

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    I did it on a different car before, $35 and 15 minutes, not oem part*
     
    Last edited: Jun 12, 2013
  7. Jun 13, 2013 at 8:58 AM
    #7
    seligman

    seligman [OP] Well-Known Member

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    Thanks. I see there are several other threads on this topic.

    In a couple of them, several people said the A/C air filter being clogged is likely a contributing factor because the resistor and connector don't get enough cold air -- and as a result -- overheat.

    I wonder if it would be helpful to switch to a non-OEM higher flow A/C filter?
     
  8. Jun 13, 2013 at 9:16 AM
    #8
    Juggernaut

    Juggernaut Captain

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    I get my cabin air filters from Amazon for ~$8, replace it every spring, no problems so far. Not sure that would cause the resistor to fail though, I would think the fan motor would fail first by a clogged filter. If your really concerned about it you can run it without a filter too, no real harm in it.
     
  9. Jun 13, 2013 at 9:20 AM
    #9
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    In those other threads there is a TSB with a new Resistor and new wires/plug to replace the old melted/burnt wires.
     
  10. Jun 13, 2013 at 11:53 AM
    #10
    seligman

    seligman [OP] Well-Known Member

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    I believe their thinking is that the restricted air flow in a clogged filter prevents cold air from blowing over the resistor and connector. Either that, or a clogged filter forces the driver to use the A/C more often, which translates to more resistor and connector heat.

    By the way, cabin air filters are much cheaper through RockAuto. Amazon sells the TYC 800038P filter for $7.78, but at RockAuto it's $3.48. Even with shipping, the price is still much less if you buy in quantity. I think I'll create a new thread on this topic. I myself am guilty of paying Amazon prices assuming they're the cheapest, but that's not always true.
     
  11. Jun 13, 2013 at 3:40 PM
    #11
    Jimmyh

    Jimmyh Well-Known Member

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    A blocked fan draws less current than an unblocked fan. Less current equals less heat.

    Just so you know. Strange but true facts. The fan is doing less work. Less work equals less heat.
     

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