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'09 2.7 A/C high pressure switch tap

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Taniwha, May 31, 2024.

  1. May 31, 2024 at 10:39 AM
    #1
    Taniwha

    Taniwha [OP] Well-Known Member

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    I am looking for help to find a tap to hook up my electric fan so that it comes on when the A/C is turned on. Any help would be appreciated. TIA Cheers, Dave
     
  2. May 31, 2024 at 12:53 PM
    #2
    shmn

    shmn Well-Known Member

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    One idea is to tap into the wire between the mag clutch and its associated relay. And use that to activate the positive side of a coil on a new relay that then feeds your fan. I think it's a purple wire. Don't have the wiring diagram in front of me but can post it later or someone else could.
     
  3. May 31, 2024 at 12:57 PM
    #3
    shmn

    shmn Well-Known Member

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    This is from a 2007 diagram, I believe.

    Screenshot_20240531-125551.png
     
  4. May 31, 2024 at 1:37 PM
    #4
    shmn

    shmn Well-Known Member

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    BTW...another option if you want to remain isolated from the vehicle electrical system is to use a temperature switch (aka snap disc) to control the fan. Like this or this. They come as NO or NC and you can get different temp set points and reset points. You can attach it anywhere you like...block, head, radiator, hose, A/C line and then determine what temp you want the fan to turn on and what temp to turn off. You can attach with plastic or steel wire ties or a hose clamp or epoxy it in place. This way you disturb the vehicle electrical system. Depending on the draw of the fan...you can wire directly through the switch or still use a relay if you like.
     
  5. May 31, 2024 at 5:44 PM
    #5
    Taniwha

    Taniwha [OP] Well-Known Member

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    2009 Taco 4cyl. 5 speed 4x4 Speedway Blue
    Thanks for all that. I've got a new temp. sender installed and the Derale fan controller has a rheostat for setting the fan on temp. And I believe the controller has a relay in it for the A/C, so just a 12v signal wire should suffice.
     
  6. May 31, 2024 at 9:44 PM
    #6
    Dm93

    Dm93 Test Don't Guess

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    Predator tube steps, Ranch Hand grill guard, Magnaflow CatBack exhaust, Toyota tool box & bed mat, 2LO Module by @Up2NoGood, Rearview Compass/Temp Mirror, Tune by @JustDSM.
    EA1 Pin 3 (Violet) is the power wire to the A/C compressor, you can use that to trigger the cooling fan to turn on with A/C.
    You can't use the pressure switch as it's just a high/low pressure cutout.
    You would need the Pressure Switch P/N 88645-04070 that comes in the condenser fan TSB kit to use for pressure based fan control but it uses a different connector (P/N 90980-10943) as it's a 4 pin switch, easiest just to use the compressor wire.
    EA1 Pin 3.jpg

    09 Engine Compartment Fuse Box.jpg
     
    Last edited: May 31, 2024
    Torspd and TnShooter like this.
  7. Jun 1, 2024 at 9:14 AM
    #7
    Taniwha

    Taniwha [OP] Well-Known Member

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    2009 Taco 4cyl. 5 speed 4x4 Speedway Blue
    Wow, thanks! I'm glad you don't charge for your services. ;-)
     

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