Thread: Cooling lines on turbo 350-which is oil out, which is return?

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Wonder why the TCI link posted earlier says the bottom is the out on 350 and 700 s

Originally posted by 38racing
Wonder why the TCI link posted earlier says the bottom is the out on 350 and 700 s

have no idea 38racing, but im going with the gm serv. manual.

The trans fluid is just like your engine oil...... you want to bring it up to temp fast to reduce sluge. Thus the fluid goes thru the trans cooler first then the aux cooler last.....Don

Dang. My radiator doesn't have a tank. All I have is an auxilliary cooler.

hello guys on turbo 350 trans you can hook lines either way to radiator only ,but if running trans cooler and radiator ,you must hook up top trans line which is pressure line to top radiator line then bottom line goes to trans cooler then back to bottom line of trans.reason for that if you hook up opposite way you are going to heat up trans fluid again going to trans cooler back to radiator

Originally Posted by damianbeau

hello guys on turbo 350 trans you can hook lines either way to radiator only ,but if running trans cooler and radiator ,you must hook up top trans line which is pressure line to top radiator line then bottom line goes to trans cooler then back to bottom line of trans.reason for that if you hook up opposite way you are going to heat up trans fluid again going to trans cooler back to radiator

This thread is 12 YEARS OLD.

But thanks for the input Damien...
If you look in the upper left corner, above the avatar, you'll notice the date. You drug one up from some time ago.

No harm, No foul.. it's more important that you thought enough to share. It's good to see you here!

Originally Posted by damianbeau

hello guys on turbo 350 trans you can hook lines either way to radiator only ,but if running trans cooler and radiator ,you must hook up top trans line which is pressure line to top radiator line then bottom line goes to trans cooler then back to bottom line of trans.reason for that if you hook up opposite way you are going to heat up trans fluid again going to trans cooler back to radiator

Transmission fluid must be at a certain temperature to operate properly. If you run it through the radiator and then through another cooler and then back to the tranny, the fluid may be too cool. But if you take the lion's share of heat out of it with another cooler and then moderate the temp through the radiator and then back to the tranny, you have oil going into the trans at the correct temperature. At least, that's what makes the most sense to me.

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Rule of thumb on lines.....the line closest to the pump will be the out line.

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Yes, old thread. But it made some good points.