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Adding a transmission cooler

Discussion in 'Towing' started by jamesausman, Feb 6, 2021.

  1. Feb 6, 2021 at 8:57 AM
    #1
    jamesausman

    jamesausman [OP] Member

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    A few questions for those that have added a second transmission cooler.

    It seems easier to add in line with the little cooler that comes with the tow package. Does it matter which cooler comes “first” in relation to the transmission? How do I know which line come “from” then goes “back to”? Please pardon my lack of proper terms here.

    The new cooler came with plastic zip ties to attach to the radiator. Seems simple enough but is it really a lot better to get some metal straps and have it a bit separated from the radiator?

    Lastly, as this is a sealed system, can I top off the fluid myself?
     
  2. Feb 6, 2021 at 10:21 AM
    #2
    azreb

    azreb Geezer

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    It shouldn't matter which is "first." I would consider the plastic zip ties to be temporary. Topping off the fluid is a relatively complicated process, if it is like my wife's RAV4. To do it right you have to monitor the fluid temperature. There are several UTube videos on the process.
     
  3. Feb 6, 2021 at 10:49 AM
    #3
    jamesausman

    jamesausman [OP] Member

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    Would it be safe to install the cooler then drive maybe 5 miles to a shop to have fluid topped off?
     
  4. Feb 6, 2021 at 5:45 PM
    #4
    TacoManOne

    TacoManOne Well-Known Member

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    I took my little cooler out and made a bracket with some steel flat bar from HD to install a huge aftermarket cooler.. Painted the brackets black. It you keep the factory cooler then you have double the number of potential leak points.
     
  5. Feb 7, 2021 at 4:05 AM
    #5
    RolfeMobile

    RolfeMobile Well-Known Member

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    Ended up rotating 90 deg., for better air flow with stock grill. But what TMOne said. Was doing the lights here.
    upload_2021-2-7_5-4-56.jpg
     
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  6. Feb 14, 2021 at 7:29 PM
    #6
    Bishop2Queens6

    Bishop2Queens6 Well-Known Member

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    I upgraded to a Hayden 679 trans cooler replacing thr OEM and I'm glad I did. I think with the OEM cooler in-line would have kept the trans temp too cool, and not in operational temperature. Just driving around town, my trans stays at 140*F which is barely warm enough for my comfort level as an operating temp for these a750 transmissions.

    I tow a 2021 Forest River No-Bo 19.8NB that is 4000# dry and 5000# full. Trans temp is around 160*F on the hwy and never got above 208*F on the steepest grades.

    I say replacement is a better option that adding as a secondary in line.
     
    openspace4x4 likes this.
  7. Feb 17, 2021 at 1:30 AM
    #7
    Dansly56

    Dansly56 Well-Known Member

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    I need this aftermarket cooler bad I was getting up to 217 going up hills. I tow a 3400lb dry travel trailer and I have a factory cooler but it’s getting to high for my liking. Any pictures of your install. Did you have to add more fluid?
     
  8. Feb 17, 2021 at 1:30 AM
    #8
    Dansly56

    Dansly56 Well-Known Member

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    any pictures of your install? Did you have to add more fluid?
     
  9. Feb 17, 2021 at 6:08 AM
    #9
    TacoManOne

    TacoManOne Well-Known Member

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    I will get some photos. I added more thru the lines before the final hookup
     
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  10. Feb 17, 2021 at 11:37 AM
    #10
    Bishop2Queens6

    Bishop2Queens6 Well-Known Member

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    I'll get some pics later today. I added about 3 quarts into the transmission via the return line of the trans cooler through a fluid pump, hooked everything back up, then went through the process of warming up the trans to proper temps and draining excess fluid through the fill level drain on the transmission pan.
     
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  11. Feb 17, 2021 at 4:10 PM
    #11
    Bishop2Queens6

    Bishop2Queens6 Well-Known Member

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    Here are some pics:

    I installed a Hayden 679 replacing the OEM trans cooler. I tried using the OEM location. The top hose had to have a loop in it (which is recommended in the Hayden 679 cooler manual) since taking a direct path would cause the hose pinch/collapse.

    I used 2 factory transcooler mounts and 1 factory bolt hole. The 3rd location at the center support where there was a transcooler bracket, I had to use an M10 bolt on the bottom left b/c the factory bolt had too big of a washer.

    I'm satisfied with the install and have no doubt in its longevity.20210217_144604.jpg 20210217_144610.jpg 20210217_144620.jpg 20210217_144631.jpg 20210217_144635.jpg
     
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  12. Feb 17, 2021 at 4:24 PM
    #12
    gearcruncher

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  13. Feb 17, 2021 at 6:26 PM
    #13
    Aquatic Tacoma

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  14. Feb 17, 2021 at 8:41 PM
    #14
    Mike G

    Mike G Well-Known Member

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    upload_2021-2-17_23-40-52.jpg

    B&M Cooler
     
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  15. Feb 18, 2021 at 9:02 PM
    #15
    Dansly56

    Dansly56 Well-Known Member

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    I ended up buying a tru cool transmission oil cooler 4590 and it’s kicks on at 180 degrees and fully opens at 205 degrees. Now I have to buy the fluid for it. What fluid did you guys go with?

    CBC2AB5D-6A5B-4B4B-BD0E-62B66A5CC531.jpg
     
  16. Feb 18, 2021 at 9:03 PM
    #16
    Dansly56

    Dansly56 Well-Known Member

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    that’s exactly where I want to set mine up.
     
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  17. Feb 21, 2021 at 1:14 PM
    #17
    TacoManOne

    TacoManOne Well-Known Member

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    image.jpg
    This is what I used. Says ok for Toyota
     
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  18. Feb 21, 2021 at 2:17 PM
    #18
    Dansly56

    Dansly56 Well-Known Member

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    right on!
     
  19. Mar 8, 2021 at 7:27 AM
    #19
    ARB1977

    ARB1977 It’s a beaut Clark

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    AB3F0BE2-DF10-4A49-A882-1978FC2584D6.jpg Add this a few years ago. Gave me about 3 extra qrts of fluid. I don’t tow anything and I haven’t put it to the test. I got it from yourcovers.com. They were looking for trucks to give reviews before it went on the market.
     
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