Z32 Automatic to oil cooler connections?

Discussion in 'Technical' started by NI85, Nov 10, 2022.

  1. NI85

    NI85 Active Member

    My Automatic had a large aftermarket cooler it was connected to. So I don't know the original connections to TT radiator.

    As the FSM doesn't appear to show me; Which of the Automatic's hard lines feed the TT radiator's top oil connection?
  2. NI85

    NI85 Active Member

    Well, with some tedious scrolling through the major overhaul procedure of the Automatic, I found that the High left banjo hard pipe connection is flow Out-> to the cooler
    and Low right is the flow in <- from the cooler.

    If following what I've read with oil flow, The top oil connection is flow back to Automatic.
    MickW likes this.
  3. MickW

    MickW Carntry member...

    So, you're wanting to run your AT fluid through an OEM TT radiator. Are you ditching the aftermarket AT fluid cooler or are you setting up to run both?
  4. NI85

    NI85 Active Member

    Just the OEM TT radiator.
  5. pauly_adams

    pauly_adams pauly

    stick with the after market cooler, the factory one in the radiator isnt great.
    MickW likes this.
  6. MickW

    MickW Carntry member...

    NI85, for your amusement mate -

    Here's some aftermarket ATF cooler setups I tried early in my rebuild, around 11 years ago.
    I'm using a large aftermarket radiator with no provision for ATF cooling or initial warming.
    * This was after fitting a 3000 RPM torque converter. Don't do that on a street driven TT. Just don't.

    The first try, 2 coolers mounted almost horizontally with a bypass thermostat to help get the ATF temp up quicker so as to allow overdrive and lockup to happen quicker in winter. Keep in mind that the OEM setup doesn't just cool the ATF, it also heats it from a cold start via the radiator.


    Soon after that I had a Toshi road tune, during summer. Up lots of hills and mountains. Saw the ATF temps hit 132*C and wanted more cooling.

    Second try, 3 ATF coolers in a staggered arrangement with the remote thermostat removed.


    Lots of overthink and overkill. I'm still running that 2nd setup. It works for storming hills on a hot day or crawling through the burbs in a traffic jam with a 3K torque converter.
    Not so great on winter mornings, I can't get above 3rd gear for ages. But it's a weekender, not a daily.
    Hah, the old girl matches me in that regard - takes a while to limber up on cold mornings :D
  7. NI85

    NI85 Active Member

    The car I have, would just be a DD. The after market cooler it had was the size of the AC condenser.
    Thanks for the pictures. If cooling is that bad: to run multiple coolers, wouldn't it be more the point to stick to a medium size and have a dedicated fan?
    MickW likes this.

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