Question after reading about tranny coolers.. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-05-2013, 08:27 AM   #1
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Default Question after reading about tranny coolers..

I've read a lot of the threads on tranny coolers, and have one final question regarding hookup.

('94 Olds LSS)

If I read things right, Willwren (and others) recommend the intake, or top line to the radiator, be unhooked and used to feed the fluid to the after-market cooler, with the fluid returning through the radiator for passage through the built-in cooler before return to the tranny.

On that note, it seems that in this way, after the cooler 'cools' the fluid, it'* fed back to the radiator which is much hotter than ambient temp, and therefore would warm it back up before going back to the tranny.

Am I on the wrong track, or would it be better to let it feed through the radiator first, then by way of the lower radiator line to the cooler and directly back to the tranny? Does this make sense?

On a side note, while I'm in Romania now, I'll be transferred back to the states in a year, and I plan on requesting someplace warm.
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Old 03-08-2013, 01:20 AM   #2
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Nobody with an opinion?
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Old 03-08-2013, 05:34 AM   #3
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I really have no experience with what the difference would be if you connected it either way. So at the very least, install it per the mfg installation directions and you will be fine. Remember, any extra cooling is going to be better than no extra cooling at all.
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Old 03-08-2013, 11:34 PM   #4
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When it comes to hotter places, I prefer larger stand alone coolers with thermo electric fans and placed up front where airflow actually does something. Same goes for trailer haulers!
Even though I know many still utilize an additional cooler with internal rad cooler, I know once things hit 100F+ outside the only real cooling will come from a larger volume stand alone up front with the temp sensing built in fans.
A larger volume transmission pan also adds greater cooling in aluminum with fins and the bonus drain plug allows frequent fluid refreshers in between major services.
Fresh friction modifiers are good for the trans.
PML Transmission Pans, YourCovers.com
I also use LubGard Red in with the Dexron 6 slick & cooler fluids guaranteed.
LUBEGARD Automatic Transmission Fluid Protectant
Consult a transmission shop for installation regarding using your additional cooler & rad for line placement in your car may be best.
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Old 03-10-2013, 11:34 AM   #5
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Some great recommendations here.

Did you know that all C body Cadillacs in the '87 to '93 era came with factory transmission coolers (and oil coolers as well)?

I have seen at least one H body Bonneville in the JY with the exact same set up.

These coolers are a direct install for the '87 to '91 era H bodies, and you can get one for about $7 in the local yards here with everything to hook it up. On the Olds "88" the lines are a bit close to the headlamp but they squeeze in there. Just remember that on the '91 up cars they used larger flare nuts on the lines so make sure you get the correct ones for your car.

As far as the fluid circulating through the radiator: The coolant in the radiator is cooler than the fluid in the engine so under many conditions it probably has less of a heating effect than you'd think. And, if the trans is still cold the radiator fluid may help the trans fluid get up to operating temperature.
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