I have a auxillary transmission cooler to install in my 90 F250 with E4OD and want it installed in the pressure line before the fluid goes into the radiator. Which of the 2 lines is the hot line into the radiator cooler? Thanks in advance, John

 

The rear fitting (on the E4OD) is the cooler return line. This means that the front fitting has fluid exiting, presumably under pressure.

If you give me a few days, I might be able to look up where the OEM auxiliary cooler goes (before or after the in-radiator cooler).

Ludis

 

[font size="1" color="#FF0000"]LAST EDITED ON 04-Sep-01 AT 07:34 AM (EST)[/font][p]Aftermarket cooler goes on the exit side of the radiator.
This is how most all of the cooler manufacturers recommend installation.


Reason......You want to start lowering the tranny fluid temp via the radiator 1st.

example using arbitrary numbers.... fluid exiting the trans is 220....engine temp is 190 , so temp of tranny fluid is dropped to around 200-190, then goes to aftermarket which drops to say 160-170 due to BEING OUT FRONT and in cooler airflow, say 90 ambient. I don't have all the calculations and stuff.

if the flow was....aftermarket then radiator you'd be returning hotter fluid to tranny, ie: cooling then heating .

put the aftermarket in the RETURN LINE and place it out front (1st behind grill).

Larry

 

Here are the connections / fluid flow for the OEM auxiliary cooler:

Front E4OD fitting
7A031 type line
Upper radiator fitting
Lower radiator fitting
7F113 type line
Auxiliary cooler driver's side fitting
Auxiliary cooler passenger side fitting
7F112 type line
Coupling
7A030 type line
Rear E4OD fitting

Ludis

 

Well that is a most interesting theory you have there on fluid temps. Actually, unless you are really working the transmission it will operate at a lower temp then the engine. The cooler line running through the radiator actually heats the trans fluid. Something you don't want. Once the trans temp rises about the engine temp' then it has a some what cooling effect. It is a total waste of time to install the external cooler before the radiator for obvious reasons. If your vehicle isn't under the factory warranty, by pass the radiator all together. Mount the cooler to the front of the radiator so that the fan will pull air through it when stopped. If you were to have to mount it elsewhere you would need to have a remote fan for when you are stopped. The engine transfers plenty of heat to the trans' by way of the bellhousing. And the Torque Converter does it's share as well. If you can keep trans temp around 160 - 180 deg. the trans will literally last for years and years if you don't abuse it and keep the fluid changed once a year. And that's my five dollars (Inflation)for today.
One more thing, Normally if the cooler lines are mounted to the trans Fore and Aft (Ford, Chry), the front line is the pressure and the real is the return. If one is over the other, the bottom one is the pressure side(GM)