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Which line is the trans cooler Return ?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Poodle Head Mikey, Jan 12, 2014.

  1. Jan 12, 2014 at 11:16 AM
    #1
    Poodle Head Mikey

    Poodle Head Mikey [OP] Well-Known Member

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    I would like to flush the transmission fluid by using the trans pumps to do it. On the right side of the transmission body are two fittings / lines which go to the trans fluid cooler. One is substantially further forward that the other.

    Which one is the supply To the cooler? Which one is the return From the cooler?

    I was going to check the operating temps with a thermocouple and consider the lower temp line to be the return - but I figured that likely somebody here would already know which was which. <g>

    PHM
    ------
     
  2. Apr 30, 2014 at 6:02 PM
    #2
    TwoTacos

    TwoTacos Well-Known Member

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    Did you ever figure out which one was the supply and return?
     
  3. May 1, 2014 at 5:35 AM
    #3
    OCNutty

    OCNutty Well-Known Member

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    Return line should be the lower one. Hot fluid goes into the top of the radiator tank, as as it cools, moves to lower outlet back to the tranny.

    You can confirm by heat as you said. Start the truck cold, and the pipe that gets hot first will be from the tranny.

    With the tow package, there are colors on the hoses (red/blue).
     
  4. May 1, 2014 at 6:04 AM
    #4
    gearcruncher

    gearcruncher Well-Known Member

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    Copied from the shift kit page

    TRANSMISSION COOLERS
    This is how Low Pressure Drop technology works::
    When Automatic Transmission Fluid (ATF) is cold it is viscous. The unique Tru-Cool design allows the colder, thicker ATF to flow more efficiently through two open bypass channels positioned at the top of the cooler. As operating temperatures increase, the ATF becomes hotter and thinner, It's then directed through the core where it is cooled. Tru-Cool's highly efficient cooling technology combines improved protection against lube failure with optimal heat transfer.
    http://www.amazon.com/Long-Tru-Cool-.../dp/B005XZXB1M
    Long Tru-Cool Oil Coolers offer advanced cooling protection for many towing applications. The advanced technology out performs TUBE & FIN Designs, Delivers up to 15 times less flow restrictions, 30% more cooling delivers maximum heat transfer, Self-Regulating for maximum lube flow protection through start-up, varied temperatures and driving conditions, heavy loads and towing.
    Here is Toyotas fluid flow guide ...Look at page 8 on this PDF http://www.toyotatundraforum.com/pdf/A750E.pdf
    And here is a guy who recently installed a cooler correctly http://www.tacomaworld.com/forum/1st...agram-pic.html
     

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