Topic: oil cooler pipes
in Forum: C3 Driveline Components

to my idea on the transmission the the upper one is outlet
lower one is inlet
and on the radiator the upper one is an outlet
and the bottom one is an inlet
so upper from transmission connected to the bottom one on radiator
and the lower one on transmission connected to the upper one on radiator?
to make it more clear what i mean i have added a picture/drawing


thank you
art-corvette

thought they might have a reason for it ?
art-corvette
The illustration indicates that Assembly #1 is the outlet assembly from the Trans, and #4 is the inlet assembly to the trans. So what Chips58 said is true.
Just my take on the drawing, seen a lot of drawing for various things illustrated in this manner.
Good Luck

Moderator

The fluid from the trans comes out of the top fitting on the trans. Normally, it will enter the rad. at the bottom fitting, come out thru the top of the rad., and return to the lower fitting on the trans.
(That being said....it really don't matter which fitting you use for "to & from". You're still using almost 200 deg. coolant to cool the trans fluid. A two or three deg. difference is not gonna make or break it.)
Bottom in-top out on rad. is normal routing. Either way will still work just as well.
I believe this method has less to do with thermal physics, and more to do with the siphoning effect of having the fluid return at the bottom of the rad.
Joel Adams
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In addition, if you put the cooler inlet at the top, there will be an air pocket in the cooler that will not purge out. This prevents the cooler from filling completely, and drastically cuts it efficiency. By connecting the inlet of the cooler at the bottom, the air purges, and the cooler works much better.
Always make the inlet the bottom.