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Transmission cooler lines - which is return?

This is a discussion on Transmission cooler lines - which is return? within the Technical / Maintenance forums, part of the General Discussion category; Guys, shop overfilled tranny and I need to get some out. There are bubbles in the fluid and from researching ...

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    Transmission cooler lines - which is return?


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    Guys, shop overfilled tranny and I need to get some out. There are bubbles in the fluid and from researching on here, that's one symptom. The fluid level is the only thing they messed with.

    So, which transmissin cooler line is the return, top or bottom? I'd assume bottom, but have been know to be wrong before :~(( Is this the easiest way to get fluid out?

  2. #2
    Master Certified Tech performabuilt2's Avatar
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    Re: Transmission cooler lines - which is return?

    the bottom is out to cooler top is return from coller
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    Re: Transmission cooler lines - which is return?

    Quote Originally Posted by performabuilt2
    the bottom is out to cooler top is return from coller
    I didn't word that very clear - I was referring to the lines that enter and exit the cooler on the side of the radiator. I guess I can get under the truck and hopefully be able to see them to trace.

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    Master Certified Tech performabuilt2's Avatar
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    Re: Transmission cooler lines - which is return?

    may be different from on vehicles you will need to trace them
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    Registered User dave89iroc's Avatar
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    Re: Transmission cooler lines - which is return?

    bottom port on trans is the outlet, top is inlet
    top port on the cooler is the INLET, bottom is outlet(design of a heat exchanger, top is always inlet)
    Last edited by dave89iroc; 06-25-2008 at 08:03 PM.
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    Re: Transmission cooler lines - which is return?

    Take the bottom line off and you will get fluid from one side or the other. I had a suction gun with a long tube that I could remove fluid from the dipstick tube. RW

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    V8 S15 Jimmy member slammins15's Avatar
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    Re: Transmission cooler lines - which is return?

    If you look at my pic you will see that hot fluid comes in the bottom and out the top.
    Last edited by slammins15; 06-25-2008 at 09:53 PM.

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    Re: Transmission cooler lines - which is return?

    Thanks guys - even though there are contradictions:~)

    Just so I'm sure - a proper ATF fluid level check should be done with hot fluid, vehicle idling on flat ground and after having cycled the trans through all the gears (pausing for a few seconds in each) - that right?

    It was always my understanding to be careful not to allow bubbles (aeration) in tranny fluid - that correct?

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    Re: Transmission cooler lines - which is return?

    Correct on every point.Hydraulics dont work good with air. RW

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    Re: Transmission cooler lines - which is return?

    FWIW - inlet to the transmission cooler on my ('97 K1500)truck was at the bottom. Seems like the pump is working against gravity too that way.

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    V8 S15 Jimmy member slammins15's Avatar
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    Re: Transmission cooler lines - which is return?

    Thats why when you see ASE certified 9 times out ten you should Ask Someone Else.
    dave89iroc

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    Re: Transmission cooler lines - which is return?

    Man I'd be pissed.
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    Re: Transmission cooler lines - which is return?

    Quote Originally Posted by weider1717
    Man I'd be pissed.
    About what?!?!?

 

 

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