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Thread: Aux transmission cooler location

  1. #1
    Join Date
    Nov 2018
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    CT
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    Default Aux transmission cooler location

    Hey guys,

    Iíll be doin a bunch of work this weekend on my 05 XC70. While Iím replacing the radiator Iím also going to splice in an auxiliary transmission cooler. My question is what is the optimal location for splicing in?

    Is it better to have it plumbed before the radiator (Aux->radiator) or after (radiator->Aux)? Iíve seen conflicting opinions across various forums so I was wondering what your take on it would be?

    Thanks!

  2. #2
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    After.

    And with a thermostat.

    So, when it’s cold, the trans fluid is warmed up more quickly. When it’s really hot, the trans fluid rejects a bit of heat to the radiator, then the trans cooler takes it below coolant temp.

    Done before, your trans fluid will always be quite hot. Greater than or equal to coolant temp and that’s above the optimum for trans fluid.

    Plumb in a filter while you’re at it.

    See this thread:http://www.volvoxc.com/forums/showth...sh-From-Bottom

    I recently did this same installation in my son’s 2001 T5. Cooler. Thermostat. Filter. Pictures above before I put the bumper cover back on.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  3. #3
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
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    Default

    After the radiator, I placed mine up high behind the upper grill after removing the bumper cover and instead of one splice coupling I used a Magnefine inline filter. Transmissions have never been know to fail from over cooling, but over heating is a prime cause of failure
    Last edited by AKAMick; 07-03-2019 at 08:34 PM.
    Current fleet: Countless P.O.S's, Rust buckets, Junk cars,( 50W Oily cesspool Sludge) Stolen and other assorted rubbish Volvo cars, 1928 Jed Clampett Tourer, ( 450K, original rust and decay, 40W Straight Bacon Grease),

  4. #4
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    Nov 2018
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    CT
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    Thanks for the responses.

    Question about the thermostat, is it absolutely necessary? And if so is 180 really the best temp or should I look for one that goes a bit cooler like 160?

  5. #5
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    I think itís important to have a thermostat.

    If itís -25, as can happen in the mountains, or Vermont, I donít want that fluid staying too cold because it is constantly flowing through an external oil-air cooler.

    My Tundra, for example, has both an oil cooler that exchanges heat with the engine coolant (and thus warms the oil) a big external oil-air transmission cooler, that has a thermostat which opens at about 200. I think they do that for fuel economy (lower viscosity = lower internal drag)

    160 would be ideal, I think, but Iíve not found one.

    They may be available. Just not easily...

    Still, if Toyota thinks 200F is OK, 180F is probably just fine.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  6. #6
    Join Date
    Nov 2018
    Location
    CT
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    Default

    Thanks so much for the insight, very much appreciated.

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