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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
    Poodle Head Mikey

    Poodle Head Mikey [OP] Well-Known Member

    Mar 13, 2013
    2007 Tacoma standard
    utility cap, ladder rack, frame hitch, sliding bed
    2007 base 2WD w/2.7 & auto trans

    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>

  2. Apr 30, 2014 at 6:02 PM

    TwoTacos Well-Known Member

    Jan 12, 2012
    First Name:
    Winnipeg, MB.
    2011 TRD DCLB Sport
    3" Leveling Kit with AAL, 5160/6112 Billsteins, LED Bed and under hood Lighting, backflip F1 tonneau cover, TRS HID Headlights, Homemade Satoshi Grill, heated seats, cluster and dash white LEDS, TPMS disable switch, ABS/VSC disable switch, fog light anytime mod, Backup Camera On anytime mod, Power locking tailgate, blue LED floor lighting c/w dimmer, tinted windows, aftermarket Nav/Audio with built in sub, aftermarket homelink.
    Did you ever figure out which one was the supply and return?
  3. May 1, 2014 at 5:35 AM

    OCNutty Well-Known Member

    Feb 27, 2012
    Northern, Va.
    Silver Prerunner DC v6 SR5 Tow
    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

    gearcruncher Well-Known Member

    Nov 1, 2012
    First Name:
    Canadain bumper technician
    Great white North 51.0333° N, 93.8333° W
    2010.TRD.SportDCLB4x4Limited leather package
    TRD Sport Rally -5 speed automatic Limited ,Factory heated leather seats ,chrome package,Super white with front windows tinted to 35 % Dick Cepek DC-2 wheels Summer tires - Good year silent armor P265/65R17 Winter tires - Good year P265/65R17 Ultra Ice studded Illuminated 4x4 switch TRD 3rd brake light cover ($20) TRD seat belt shoulder protectors (5). ($50) TRD ...B pillar emblems ($20) TRD rear slider sticker with devil horns ( $6) TRD summer floor matts ($60) TRD steering wheel emblem ($20) TRD floor pedals .($95) TRD shorty antenna ($14) TRD front Windshield emblems ($17) TRD head pillows .($60) TRD head rest protectors TRD door scuff protection $20 TRD floor matt emblems ($40) TRD tow plug emblem . ($40) TRD cigarette lighter with LED.($35) TRD tissue dispenser ($12) TRD front bezel emblems ($9) TRD door emblems ($6) TRD lanyards($9) TRD lisence plates with TRD bolts($50) TRD fender emblems TRD center caps Part Number:PT904-35070-CC ($80) TRD cd
    Copied from the shift kit page

    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.
    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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