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Seems transmission coolers really are beneficial...

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by savage1987, Apr 12, 2009.

  1. savage1987

    savage1987 Donating Member

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    I'm in the process of replacing my 500,000+++km VN V6 engine with a rebuilt VR V6. While preparing to remove the original motor, I dumped the transmission fluid, having driven it approximately 15,000km since the last change. Usually after 20,000km (my regular auto service interval) the fluid is a murky brown colour. Last time I did a fluid change (15000km ago) I installed two additional transmission coolers, making three in total.

    I will post up photos shortly of the fluid in the bottom of the pan. It looks like it was changed only yesterday. I am extremely pleased to find this and will look at increasing the service interval for my automatic transmission to possibly 30-40,000km.

    Sam



    photos:

    15,000km fluid:
    [​IMG]





    ATF cooling path:

    passes through radiator in-tank cooler first
    [​IMG]

    then out the side and through this Hilux diesel cooler
    [​IMG]

    then around the front and through this random other cooler I found
    [​IMG]

    then back to the transmission
    [​IMG]
     
    Last edited: Apr 12, 2009
  2. immortality

    immortality Moderator Staff Member

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    yep, auto transissions live or die by the running temp of the fluid. get it too hot and the fluid can create a varnish on the inside of the trans, when this happens it looses it's ability to transfer heat (i.e. it looses it's cooling properties). excessive heat will also harden seals and other plastic/rubber parts.
     
  3. savage1987

    savage1987 Donating Member

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    I was stunned. I have never seen fluid this clean come out of a transmission in my life. It made me so happy :)
     
  4. Ado

    Ado Are we there yet?

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    Hope they arnt the tyres you drive on.
     
  5. savage1987

    savage1987 Donating Member

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    Yerp. Not for long though. You should see the other set ;)
     
  6. rob drag racer

    rob drag racer vn vp drag nut

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    i ran one on my fairlane and i have to say it dose stabilize the fluid temp far better with a trans cooler and as for shift performance it helps and long lasting trans fluid for sure unless you tow huge weight often so yeh a trans cooler is the way to go :thumbsup::thumbsup:
     
  7. savage1987

    savage1987 Donating Member

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    I've had a couple of people comment that three coolers are a bit .. well.. overkill. Here's how it came about:

    I was only going to add that one at the front but I ran out of hose and needed the car back on the road immediately. I hunted around the shed and found two short bits of hose but nothing I could use as a joiner. Then I had an idea that another cooler could do the job as a joiner.. I found one I had lying around and figured out I could mount it on that convenient diagonal rail in front of the passenger wheel :)

    Was never intended to be 3 of them, but it seems to work quite well!
     
    Last edited: Apr 12, 2009
  8. v8_bomberdore

    v8_bomberdore New Member

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    dont run the lines through the radiator, it will run even cooler again
     
  9. savage1987

    savage1987 Donating Member

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    I doubt it. The ATF leaves the gearbox a hell of a lot hotter than the coolant at that end (cool end) of the radiator. That fluid heat transfer that occurs in there is far more efficient than the air cooling that occurs in the other two.

    edit: just noticed, this is my 2,345th post :p
     
  10. eurekamad94

    eurekamad94 street kiddo

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    damn! thats preety clean for 20,000k fluid
     
  11. rob drag racer

    rob drag racer vn vp drag nut

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    i agree best to run it via the rad after all in a normal situation the rad isn't to bad i wouldn't run the a/t to cold you may cause damage
     
  12. savage1987

    savage1987 Donating Member

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    I don't think it's running too cold. Not much chance of that really with the amount of heat soak from the engine
     
  13. Morton

    Morton For external use only

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    You should rotate your diagonal cooler to actually face oncoming air :)
     
  14. savage1987

    savage1987 Donating Member

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    Too much like hard work. It still radiates, that's good enough for me
     
  15. jas98

    jas98 Active Member

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    i put one one me vs the other day..however im not sure if i hooked it up right as i ran the top hose from the radiator to the cooler then cooler back to the trans..? is this teh correct way? as i want it to go from trans to radiator then radiator to cooler then back to trans but dunno if if i hooked it up right:p

    cheers
     
  16. savage1987

    savage1987 Donating Member

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    I THINK you actually need to put it in the bottom hose. The top one is the feed line FROM the auto. At least, I really hope it is otherwise mine are in wrong :p


    **someone able to verify this?**
     
  17. PaRaDoX

    PaRaDoX Because Racecouch...

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  18. savage1987

    savage1987 Donating Member

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    my transmission must be so happy. It didn't even stink :)
     
  19. pando666

    pando666 milk comes in 2 litres

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    So does anyone know for SURE which hose to put the cooler in bottom as you(savage)has done or top as Jas did?.
     
  20. azzfox

    azzfox Braaap.

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    Id say bottom which is the return line. The radiator cools the fluid to engine temp which is still quite hot. You dont want to cool the fluid through a cooler then heat it up again before returning to the trans.
     

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