Automatic transmission radiator oil cooler bypass - Page 2 - Nissan Frontier Forum
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post #11 of 659 (permalink) Old 03-07-2009, 06:22 PM Thread Starter
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Originally Posted by Not2swift View Post
Is the cooler in front of the radiator a trans cooler? I'm not that educated in this area.
Yes, it surely is.

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post #12 of 659 (permalink) Old 03-07-2009, 06:30 PM
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Well I may have misunderstood him. But he did mention purchasing a quality external trans cooler. Anyway, he did recommend the bypass to eliminate contamination of trans fluid.
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post #13 of 659 (permalink) Old 03-07-2009, 06:45 PM
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SO I guess I miss the reasoning behind this mod too? only because of a possible contamination? I don't think I want to bypass any of my cooling. I want max cooling on everything.

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post #14 of 659 (permalink) Old 03-07-2009, 06:51 PM Thread Starter
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SO I guess I miss the reasoning behind this mod too? only because of a possible contamination? I don't think I want to bypass any of my cooling. I want max cooling on everything.
It's to avoid the possibility of coolant entering the transmission fluid and ruining your high dollar transmission. The trans oil cooler doesn't hold much fluid to begin with. While you're driving, the pump pushes the fluid through that little cooler so fast I doubt if it will make any significant difference.

If it were not for the larger cooler in front of the condenser, the radiator cooler would be almost useless in the current size. The front oil cooler can cool better than the engine coolant can because it's right in the air stream whether you're moving or not.



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post #15 of 659 (permalink) Old 03-08-2009, 07:33 AM
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What harm can it do? .
The hellish Florida heat?!

I just don't see Nissan going through the expense of putting it there for no reason.

Oh, I just though of something. We have an AT temp warning light so I suppose you could monitor that for potential heat issues.
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post #16 of 659 (permalink) Old 03-08-2009, 08:10 AM Thread Starter
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The hellish Florida heat?!

I just don't see Nissan going through the expense of putting it there for no reason.

Oh, I just though of something. We have an AT temp warning light so I suppose you could monitor that for potential heat issues.

As I stated earlier, the radiator oil cooler doesn't hold much fluid. The very large auxiliary oil cooler can handle the Florida heat much better than the tiny oil cooler I took out of the circuit. Besides that, the cooling fan for the condenser is behind the aux cooler. If you use your AC like I do in the hot summer months, there should not be any excessive heat issues in the transmission. I don't expect any negative issues from this slight modification.



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post #17 of 659 (permalink) Old 03-14-2009, 01:02 PM
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Zero Six LE, Thanks much for the write up and the pictures. I am planning on doing this mod whenever I get a chance. You mentioned that the inlet hose needed to be clamped to prevent the fluid from draining out. Did you use those vice grips to clamp the hose? If not, please let us know what you did use.

Regards.
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post #18 of 659 (permalink) Old 03-14-2009, 01:37 PM Thread Starter
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Zero Six LE, Thanks much for the write up and the pictures. I am planning on doing this mod whenever I get a chance. You mentioned that the inlet hose needed to be clamped to prevent the fluid from draining out. Did you use those vice grips to clamp the hose? If not, please let us know what you did use.

Regards.
You're welcome. Yes, I used a small pair of Vise grips to clamp the hose. Just don't clamp down on it too much where it will be damaged.



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post #19 of 659 (permalink) Old 03-14-2009, 11:05 PM
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Thanks Zero Six LE!

I ordered the part tonight and will be doing this mod during my next oil change. Our 2k5 only has 23k miles on it so far, but I will be driving the truck for at least the next decade or so.

Thank you for the great write up and part number. You are definitely correct that the towing package cooler is MUCH larger than the transmission based one so unless you live where the temp gets up above 120 and you tow non-stop this mod is much better than a new transmission any day of the week.

On your write up can you state the amount of time that it took? Guesstimate.

Thanks again!

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post #20 of 659 (permalink) Old 03-15-2009, 07:42 AM Thread Starter
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Originally Posted by Volcano_God View Post
Thanks Zero Six LE!

I ordered the part tonight and will be doing this mod during my next oil change. Our 2k5 only has 23k miles on it so far, but I will be driving the truck for at least the next decade or so.

Thank you for the great write up and part number. You are definitely correct that the towing package cooler is MUCH larger than the transmission based one so unless you live where the temp gets up above 120 and you tow non-stop this mod is much better than a new transmission any day of the week.

On your write up can you state the amount of time that it took? Guesstimate.

Thanks again!
You're welcome and thank you. It can be done in way under an hour if you don't have to take pictures while doing it. I removed 14¾" from the long hose and 4¼" from the short hose from the radiator cooler ends.

Quote:
Originally Posted by NCFronty View Post
SO I guess I miss the reasoning behind this mod too? only because of a possible contamination? I don't think I want to bypass any of my cooling. I want max cooling on everything.
I removed a trans oil cooler from a Dodge Ram 2500 radiator. It's from a cross flow radiator and ours is a down flow radiator. The same cooling principles apply though. The engine coolant helps dissipate the heat from the hot ATF after the coolant has been cooled in the radiator.

Our radiator cooler is probably a little smaller than this one but I'm not sure. There is not much room inside the tubes for ATF on this cooler or the one in our Frontiers. The Dodge did not have an auxiliary oil cooler and it's a full size 4X4.

In theory, the ATF is the hottest as it leaves the transmission. I took temperature readings from the front mounted cooler last week. In naturally runs cooler when the ambient temperature is low. The lowest reading I took after driving 24 miles to work was on a foggy morning and it was 54°F. The hottest reading on the cooler was 99°. The hottest reading so far was on my trip home from work was 164° where the outside temp was 75°F.

The pan temperature was much lower than the cooler temp so it's doing the job it should do. The main thing to worry about is when you're towing a heavy load in hot temperatures or climbing hills. I don't plan on doing either of those things.









Last edited by Zero Six LE; 03-15-2009 at 09:13 AM. Reason: Automerged Doublepost
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