4l60e cooler line/aux cooler

burbanswervin · May 13, 2024

I am hooking up a new aux cooler and lines for my 96 suburban 5.7vortec, to my knowledge the supply line ( bottom port) is supposed to go to the bottom port right side of radiator; which then passes up the rad exiting the top port right side of the rad, then connecting to the top port of the aux cooler to be cooled once more,cool atf then exiting bottom port of the aux cooler sending cooler atf back to the a/t through the top (return) port. Am i correct? Reason for asking is the previous owner had this reversed which may have caused the blown transmission. The way it was routed before the supply pressure port was sending the hot atf to the top port of the rad through to the bottom port of the aux cooler

GoToGuy · May 13, 2024

Check this out.

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burbanswervin · May 14, 2024

GoToGuy said:
Check this out.
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Thats basically exactly what i explained except the exit of the cooled atf from the aux cooler is exiting from the top port, my knowlege is that it cools better if the atf passes through the top first being cooled and exiting the bottom port to go back to thr transmission

GoToGuy · May 14, 2024

This is how the factory sets it up. I tend to think they know what there doing. So the answer you get would be what factory designed. If your results are better let us know.

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L31MaxExpress · May 17, 2024

GoToGuy said:
This is how the factory sets it up. I tend to think they know what there doing. So the answer you get would be what factory designed. If your results are better let us know.
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That is absolutely not how mine was setup from the factory on my 97 Express and 99 Tahoe. Hot fluid entered the top of the radiator on both and exited the bottom. Factory Express van diagram for reference. Fluid flows down from the top to the bottom because it cools the best with the coolest point of the radiator being the coolant outlet from the radiator at the bottom. My 97 Express van did not have the OE auxiliary cooler but my 99 Tahoe did. All 3 of the older G-vans I have owned a 1983, 1987 and 1994 were also setup with the cooler inlet at the top and outlet at the bottom. The one GM exception I have seen to this was my 1990 RS Camaro. The hot fluid entered the lower port on that car. The Camaro's transmission made much less heat thus GM probably did that to reduce the cooling in that application.

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GoToGuy · May 17, 2024

This? I'll check where I got those diagram s.

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udidwht · Aug 8, 2024

The proper trans cooler line routing is from the trans to the radiator then onto the external trans cooler before returning to the trans.

That is how the OEM set up was on the GM P-series chassis with an external cooler.

L31MaxExpress · Aug 8, 2024

udidwht said:
The proper trans cooler line routing is from the trans to the radiator then onto the external trans cooler before returning to the trans.

That is how the OEM set up was on the GM P-series chassis with an external cooler.

That is how I have seen it on 95% of GM vehicles. Fluid from the transmission enters at the top port of the radiator, exits the lower port, then goes to the auxiliary cooler before returning to the transmission.

udidwht · Aug 8, 2024

L31MaxExpress said:
That is how I have seen it on 95% of GM vehicles. Fluid from the transmission enters at the top port of the radiator, exits the lower port, then goes to the auxiliary cooler before returning to the transmission.

Yep, they set em up that way for worst case scenario such as grade pulling/towing. The added heat picked up will be cooled prior to returning to the trans.

L31MaxExpress · Aug 9, 2024

udidwht said:
Yep, they set em up that way for worst case scenario such as grade pulling/towing. The added heat picked up will be cooled prior to returning to the trans.

Absolutely. Flowing down through the radiator with the transmission fluid outlet at the coolest point of the radiator they were extracting as much heat as possible. I have seen some GM passenger cars like F-cars with the radiator cooler flow reversed but I assume GM did not intend on them to require as much cooling.

4l60e cooler line/aux cooler

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