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AC Blows Hot When on Cold Setting and Cold When On Hot Setting

Discussion in '2nd Gen. Tacomas' started by ibuprofelin, Aug 25, 2013.

  1. Sep 12, 2013 at 4:19 AM
    #21
    ibuprofelin

    ibuprofelin [OP] Well-Known Member

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    Bump for the answer!
     
  2. Sep 13, 2013 at 4:57 PM
    #22
    ibuprofelin

    ibuprofelin [OP] Well-Known Member

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  3. Sep 30, 2013 at 2:25 PM
    #23
    silver streak taco

    silver streak taco Well-Known Member

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    just switched mine out too and it blows hot on cold and cold on hot. any answers or did you figure it out?
     
  4. May 28, 2014 at 7:35 AM
    #24
    db2

    db2 Well-Known Member

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    I have a working solution for this! As Jones mentioned, pre-2009 Trucks use opposite voltage from the 2009-2014(?) trucks to control the temperature. The result is a backwards dial. The solution is to switch the contacts on the control knob so that it feeds reverse voltage from the original design. This is done by cutting the original circuit board connections, and rewiring the connections to the opposite pins of the control knob. One other note, like the OP, My A/C Control wire needed to be on Pin 13 (not 16) on the A33 Connector. My truck is a 2006, so I also needed to make a connector from the A16 connector to the A33 connector.

    Sorry I didn't take a picture, I was in too big of a hurry to get it back in the truck!!!

    The solution to this is as follows:

    1. Take apart the A/C Control panel, and isolate the circuit board.
    2. On the back side of the board you will find 3 pins coming from the Potentiometer (Control Knob)
    3. You will see 3 leads coming from the Control Knob. To get the correct orientation, rotate the board until the lead with the thickest "trace" is at the top (12:00) position, and the bottom lead is a "trace" that leads to a resistor. (note: on the graphic, you will not see the control knob as it is on the opposite side of the circuit board)
    4. With a razor blade, cut through the top 2 leads (Do not cut the bottom lead). This will disconnect the control knob from the circuit.
    5. With a razor blade, lightly scrape the "trace" of the top 2 leads to expose a small section of copper "trace". Then meter between the exposed "trace" and the lead from the corresponding control knob lead and make sure there is no connection. If you still have a connection, you need to cut deeper in step 4.
    6. Add a bit of solder to each of the exposed copper "traces" and cut two small wires and tin the ends with solder. Solder one wire to to one of the Control Knob leads, and to the opposite trace at the exposed copper trace. Repeat with the other Control Knob lead, and opposite trace.
    7. Meter between the Control Knob Lead and another point along the trace to make sure your solder connections are solid.
    8. Reassemble the A/C Controller and enjoy proper Cold/Hot Settings :)

    [​IMG]
     
  5. Jan 25, 2015 at 7:10 PM
    #25
    bradforj

    bradforj Well-Known Member

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    2011 taillights and grille Steering wheel swap w/audio and BT controls Auto-dimming mirror Backup camera DNX691HD head unit Kenwood speaker system Kobalt slim toolbox In channel Ventvisors N-Fab running boards
    Thanks for sharing this info and graphic. I now have proper hot/cold settings :)
     
  6. Jan 26, 2015 at 7:42 AM
    #26
    db2

    db2 Well-Known Member

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    You're welcome, sorry for the terribleness of the graphic :)
     
  7. Mar 26, 2015 at 6:49 AM
    #27
    steveh_2007

    steveh_2007 Well-Known Member

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    NW Houston, TX
    Vehicle:
    07 TRD Sport PreRunner
    TRD Baja Suspension, TRD Cat-back Exhaust, TRD Cold Air Intake, TRD GrillCraft MX Grilles, FX-R 3.0 Bi-Xenon Retrofit with Osram CBI Bulbs, OEM Navigation/Bluetooth/Backup Camera Retrofit, WeatherTech Floorliners, Valentine One, ScanGuage II with custom V1/SGII BlendMount
    Would either of you being willing to perform this fix for me? I have a set of 2012 climate controls that I'm wanting to make plug n play on my 2007.

    I would pay shipping both ways? I know I couldn't be the only one on TW that's wanting to do this mod...
     
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