Transmission cooler inside radiator

Discussion in 'Engine & Drivetrain' started by Trailblazzin, Dec 22, 2018.

  1. Doubeleive

    Doubeleive Elite Member Supporting Member

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  2. 97audia4

    97audia4 Member

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    How I mounted my cooler

    IMG_20180928_184940.jpg
     
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  3. thompsoj22

    thompsoj22 Full Access Member

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    08 yukon denali xl1500 6.2, on a recent trip at freeway speeds with an outside temp of 43f the trans temp never went above 78f. on a trip while towing our 4,500lb travel trailer up a steep grade with an outside temp of 85f the trans hit 210f. i do have the factory trans cooler but can see it is not thermostatically controlled. i will add the aftermarket cooler but i think ill go with a thermostat. Anyone know if it is detrimental to run a automatic trans with cold fluid temps for an extended period of time?
     
  4. Doubeleive

    Doubeleive Elite Member Supporting Member

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    that doesn't sound right mine will hit 76 just idling in the driveway and I have the deep pan and truecool, it may take a few minutes to warm up on the freeway but definitely does not stay that low
     
  5. Doubeleive

    Doubeleive Elite Member Supporting Member

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    This is after about 1/2 mile at 25-30mph, 50deg outside

    IMG_20190111_075158.jpg
     
  6. Doubeleive

    Doubeleive Elite Member Supporting Member

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    Then after about a 3 Mile trip at speeds up to 70

    IMG_20190111_081830.jpg
     
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  7. BG1988

    BG1988 Member

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    Honestly with dexron 6 there is very low minimum temp

    viscosity of Dexron VI transmission fluid is thin even at 72F

    it's the same viscosity as warmed up Dexron III

    seems the actual minimum temperature is 72F recommend temp
    but it does not really matter much
    lower temp = longer life




    MAX continuous operating temp is 212/100C but the transmission will not last very long at that temp

    minimum operation temperature is Negative -45C after that it becomes too thick to use/a solid
     
    Last edited: Jan 11, 2019 at 12:43 PM

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