E4OD Problem
Posting Guru
Joined: Apr 2003
Posts: 1,153
Likes: 1
From: Venezuela
Upsss! thats very hot... hight hummidity reduce air speed trought radiator, reducing also heat transfer.
Have a look at www.haydenauto.com
Have a look at www.haydenauto.com
New User
Joined: Jul 2010
Posts: 1
Likes: 0
E4OD boil over
I've been dealing with this same problem for the last 6+ weeks on my E4OD that was rebuilt 4 years ago that is in my '93 F350 4x4 crew longbed with 165K mi on it. I think I've gotten to the route of the problem.... it seems that the coolers built into the radiators start to fail and in turn cause flow restriction. No problem at lower temps but as stated in other posts, when fluid gets very hot, it expands and blows out vent(s) on top of trans. As well when the fluid expands it fills the case and floods over the gears on the top side, gets all churned and bubbled up in the gears and that in turn reduces the ability for the fluid to dissipate heat. Some told me to bypass the Rad cooler since there is an external one also but this wasn't an option for me because I live in snow country and the line through the rad actually heats the fluid to opperating temp in the winter. So I replaced the radiator and totally flushed the trans, Torq conv, along with filter change and replaced fluid. Appx $500 in but seems to have fixed it, hope this helps somebody.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,731
Likes: 2,658
From: SE Florida
I've tested trucks and cars in temperatures as low as -40. I've measured the ATF temperature going into and coming out of the radiator cooler. I never found ANY time where the ATF coming out of the radiator cooler was warmer than the ATF going into the radiator cooler. The radiator cooler ALWAYS cools the ATF, whether the outside temperature is hot or cold.
The coolant in the radiator is at ~200°F entering the radiator once the engine is warmed up. In cold ambients the radiator is very, very efficient at removing heat from the coolant. By the time the coolant makes it across the radiator to the return tank where the transmission cooler is located it can be just about as cold as ambient temperature. If you are driving where the temperature is 0°F the water surrounding the radiator cooler will be between 0°F and about 10°F. This is from actual test data that I collected, not just what I think will happen.
That is the right way to fix it. Bypassing the radiator cooler greatly reduces the transmission cooling which leads to an overheated transmission and a rebuild.
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