Keep your automatic transmission alive, review/installation of Derale's tranny cooler - Page 17 - JeepForum.com

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post #241 of 499 Old 06-03-2013, 10:12 AM Thread Starter
Jerry Bransford
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Because it does not matter.
Which way the ATF flows through the aux cooler inside the radiator doesn't matter, that is true. The difference between which is the inlet & which is the outlet on the bottom of the radiator does matter to the plumbing from the transmission though. The ATF flows one direction through the radiator cooler with 2002 and older TJs and the opposite direction with 2003 and newer TJs. That is due to the transmission's hard coolant lines, 32RH vs. 42RLE, and how they are bent & positioned for their connections to the cooler inside the radiator.


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post #242 of 499 Old 06-03-2013, 10:15 AM
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Originally Posted by Jerry Bransford View Post
Which way the ATF flows through the aux cooler inside the radiator doesn't matter, that is true. The difference between which is the inlet & which is the outlet on the bottom of the radiator does matter to the plumbing from the transmission though. The ATF flows one direction through the radiator cooler with 2002 and older TJs and the opposite direction with 2003 and newer TJs. That is due to the transmission's hard coolant lines, 32RH vs. 42RLE, and how they are bent & positioned for connection to the cooler inside the radiator.
Correct, that's why I left him a PM where I could call him and possibly explain better.
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post #243 of 499 Old 06-03-2013, 11:02 AM
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Once on my previous TJ I had a B&M transmission cooler in stacked plate design. I cannot recall the model number anymore ...

The instructions clearly warned from swapping in and outlet. Flow direction was predetermined.

Reason: it was a cooler built specifically as transmission oil cooler with built in cold oil bypass which only works correctly in one direction!

I can understand that coolers with in and out markings can cause questions...

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post #244 of 499 Old 06-25-2013, 08:15 PM
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Anybody happen to know the flow rate of the tranny oil going to the radiator?

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post #245 of 499 Old 06-25-2013, 09:32 PM
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Anybody happen to know the flow rate of the tranny oil going to the radiator?
About 3 quarts in 200ft at 60 mph (32RH)...
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post #246 of 499 Old 06-26-2013, 08:22 AM
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How often does your cooler fan come on?

My fan is on most of the time. Even when the outside air temperate is 50, after driving for a bit the cooler fan kicks on. Seems like the fan is on way too often. My engine temperature holds at 210/220.

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post #247 of 499 Old 06-26-2013, 08:28 AM Thread Starter
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My Derale's fan is off more than it is on, even on really warm days.

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post #248 of 499 Old 06-26-2013, 08:47 AM
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My Derale's fan is off more than it is on, even on really warm days.
So I wonder if my radiator is not cooling the tranny fluid as much as it should? The radiator was plugged with mud a while ago. I pressure washed all the mud out of the radiator fins. Other thoughts of what may cause the radiator to not cool the tranny fluid?

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post #249 of 499 Old 06-26-2013, 01:25 PM
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Originally Posted by explorerlyon View Post
So I wonder if my radiator is not cooling the tranny fluid as much as it should? The radiator was plugged with mud a while ago. I pressure washed all the mud out of the radiator fins. Other thoughts of what may cause the radiator to not cool the tranny fluid?
=
Buy or borrow an infrared temperature gauge and see what the temp is. Measure the temp in and out on your cooler and in and out at the rad. I suspect your have a bad temp switch.
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post #250 of 499 Old 06-29-2013, 08:30 AM
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Originally Posted by explorerlyon View Post
So I wonder if my radiator is not cooling the tranny fluid as much as it should? The radiator was plugged with mud a while ago. I pressure washed all the mud out of the radiator fins. Other thoughts of what may cause the radiator to not cool the tranny fluid?
Do you have the cooler lines going through the radiator the correct way? If they're wrong the radiator isn't pre-cooling the fluid before it gets to the Derale, which could cause it to run more.
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post #251 of 499 Old 06-29-2013, 10:25 AM
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Mine is on most of the time also once it warms up, Seems like I have it hooked up right,,, Out of driver side radiator to cooler with temp switch, out of cooler to tranny!!!! sound right?
I even removed that return line behind cat completely. Now i come out of cooler and go straight into tranny.
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post #252 of 499 Old 06-29-2013, 11:24 AM Thread Starter
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Mine is on most of the time also once it warms up, Seems like I have it hooked up right,,, Out of driver side radiator to cooler with temp switch, out of cooler to tranny!!!! sound right?
Yep you got it right, that is the correct side with 2003 and newer TJs.

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post #253 of 499 Old 07-10-2013, 07:03 PM
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Installed mine yesterday. The bolts that hold the cooler to the bracket were a PITA and I wish the hose that connects to the hard line was about 3" longer. If it was I could have tied it off better over the DS. It have about 2' of hose flying through the air but I'm confident they are safe. The kit was also short 4 of the 1" foam squares and I had to make some. Other than that I'm satisfied with it.

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post #254 of 499 Old 07-10-2013, 10:05 PM
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Another nod for a pretty darn good product. Mine's been on for a month or so and only rarely kicks on, even in 90+ weather. Still not used to it though, so it scares the crap out of me every time!
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post #255 of 499 Old 07-13-2013, 12:37 PM
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I have a question about line routing up front.

I ran the cooler lines along the frame to the point where the factory lines all turn up. From there I have them tied together and they "fly through the air" over the DS/pumpkin to the radiator. The length of the lines doesn't offer much room for creativity. I'm pretty confident that they are out of harm's way but wish I could do something to make it easier to tie them down. Anyone have pics of their setup or suggestions?

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