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Thread: Trans Cooler hook up

  1. #1
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    Default Trans Cooler hook up

    I am adding a trans cooler to my TJ 2005 unlimited auto trans and not sure the best way to hook it up.
    Should it flow thru the rad cooler and then the Aux cooler or thru the Aux cooler and then the rad cooler.
    I live in Wisconsin where I need the trans fluid to warm up to a controlled temp in the winter. I have an electric fan on the rad and am using an extruded aluminum finned dual pass cooler mounted where the sway bar was mounted on the frame in front of the grill shell. I thought about mounting it behind the High Rock front bumper but not sure there would be enough air flow.
    The lines into the rad, which one is inlet and which is outlet?
    Thanks for any help

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    Land Squid Jeffb_79's Avatar
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    Just read through this thread the other day on rof....

    http://www.rubiconownersforum.com/ph...p?f=23&t=68409

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    Senior Member HillBillE's Avatar
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    Quote Originally Posted by C130Hilgy View Post
    ...................I live in Wisconsin where I need the trans fluid to warm up to a controlled temp in the winter. I have an electric fan on the rad and am using an extruded aluminum finned dual pass cooler mounted where the sway bar was mounted on the frame in front of the grill shell..........

    Cold shouldn't be a problem, as long as the cooler is sized for your rig.

    I run one on my '99 XJ, and it's right in front of the radiator (no winch or lights blocking the air flow)
    And haven't had any issues from the cold.

    I'm 350 miles north of ya, and it's -19*F today

    I drove about 130 miles yesterday in total, with temps around -5* and have had no problems. (also my second winter with it installed)

    I believe my tranny cooler is 9x13, which is pretty big, but since I drive out to Moab through the mountains, while towing my adventure trailer, I wanted the tranny to stay cool!
    HTH! And good luck!


    As long as the people remain armed,
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    Land Squid Jeffb_79's Avatar
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    Oh, and as far as the radiator lines go, unplug one, I'd probably start with the top one. Crank the engine.... if fluid starts coming out of the hose, thats your input line to the radiator.

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    Default HillBille

    Are you flowing from the trans to the aux. cooler then to the rad and back to the trans.
    Thanks Lee

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    Thats the way it should go.
    Trans > cooler > radiator > trans

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    the radiator should be the last one to get the fluid before it goes back to the trans, auto's like trans fluid to be a certain temp, too cold/too hot and its not going to perform to its optimum.

    routing secondly to the radiator will bring the temp up faster if its not warm enough yet. like idling on a cold trail.

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    Senior Member HillBillE's Avatar
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    Quote Originally Posted by C130Hilgy View Post
    Are you flowing from the trans to the aux. cooler then to the rad and back to the trans.
    Thanks Lee
    I'll have to check, but I think mine runs from:
    trans>rad>aux>back to trans.


    Quote Originally Posted by 91YEEPER View Post
    the radiator should be the last one to get the fluid before it goes back to the trans, auto's like trans fluid to be a certain temp, too cold/too hot and its not going to perform to its optimum.

    routing secondly to the radiator will bring the temp up faster if its not warm enough yet. like idling on a cold trail.
    Once the tranny is warmed up, cold will not affect it.
    My XJ won't blow heat unless it's moving, even now when it's -20*F, I only 'warm it up' for a minute or so, before taking off.

    You have to really cool the tranny fluid down to have a problem.

    A good example was the Dodge minivans of the late '80's.

    If they had the towing package, they had a huge tranny cooler.
    Get temps around -10 tp -20*F, and hit the freewy at 65mph, the 'wind chill' will be around -50 to -65*F, and with the large external tranny cooler, the fluid would jell, and the tranny would burn up.

    At least that was the excuse/reason the dealership gave my dad for his '89 Caravan, after the third tranny in 2 winters

    We get cold spells of 2-3 weeks of well below Zero weather every year, and I've only seen a handful of problems from the tranny fluid being to cold.

    In the 4 years I drover wrecker, I only had one fluid related tow, and that was a broken return line on a plow truck Kid just kept plowing until the truck wouldn't move anymore!


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    Senior Member HillBillE's Avatar
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    Found this on : http://www.carcraft.com/howto/transm...all/index.html

    Often, external trans coolers are plumbed so that they replace the stock in-tank radiator cooler, but most OE and trans cooler manufacturers recommend retaining the factory cooler, using the external cooler to increase the system's heat-transferring capacity. Proper routing passes the fluid through the radiator cooler first, then on to the external cooler before heading back into the transmission.
    This is how I ran mine.


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    Quote Originally Posted by HillBillE View Post
    Once the tranny is warmed up, cold will not affect it.
    My XJ won't blow heat unless it's moving, even now when it's -20*F, I only 'warm it up' for a minute or so, before taking off.

    You have to really cool the tranny fluid down to have a problem.
    i had issues snow wheeling in big bear or up in the sierra nevada's the couple times i went with the 727 i was running wouldnt stay warm, then as soon as i would get on it to go it would over heat in 20 minutes of right foot wheeling. i couldnt win in the cold with that tranny though.

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