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Old 03-07-2009, 01:19 PM
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Automatic transmission radiator oil cooler bypass

I decided to take the radiator oil cooler out of the circuit and just use the big oil cooler that's used for the towing package. At least one CF member had coolant contaminate his transmission fluid. I don't want to take that chance so I modified mine.

Parts that I used.


I was going to use these clamps with the vacuum caps but decided to use the factory ones for now.


Remove the front air spoiler and skid plate. You will need to clamp the inlet hose to prevent the transmission fluid from draining out. That's the long hose leading to the trans oil cooler on the driver's side.




Route the long hose to the right to connect it to the short hose. I used a PVC pipe cutter and cut both hoses at the same time once I decided where to cut. Take your time and make sure you don't kink the hoses before cutting them. If you cut them too short, you will have to buy new hoses and start over.
Insert the tube joint and clamp the hoses onto the joint.


Vacuum caps covering trans oil cooler hose barbs.


I use two 5/16" vacuum caps to cover the hose barbs on the trans oil cooler. I used the old factory clamps since it doesn't have to be really tight. It's just to keep it clean. You could opt for standard hose clamps or some like shown in the 2nd photo above. Pour any drained fluid back into the transmission if you drained it into a clean container. Start the engine and check for leaks.
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Last edited by Zero Six LE; 03-07-2009 at 06:00 PM. Reason: Added photo
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Old 03-07-2009, 01:40 PM
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Nice write up. Its really not very hard is it?

The only downside to this, and why when I put my tranmission cooler in- i put it in line with my radiator cooler on my pathfinder, is the radiator does not warm the tranny fluid. So you might get some harder shifts in the morning in the winter..
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Old 03-07-2009, 01:44 PM
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Nice write up. Its really not very hard is it?

The only downside to this, and why when I put my tranmission cooler in- i put it in line with my radiator cooler on my pathfinder, is the radiator does not warm the tranny fluid. So you might get some harder shifts in the morning in the winter..
Thanks. It's not hard at all. Florida winters are not that brutal. I'll see how it goes.
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Old 03-07-2009, 01:45 PM
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I really like the caps, most people just leave that stuff open.
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Old 03-07-2009, 05:50 PM
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who on here had coolant in there trans fluid? i must have missed that.
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Old 03-07-2009, 05:50 PM
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Living in Florida, did you really want to do this? I have the Nismo, no tow package and I have the dual coolers, like you do. I thought all V-6s came like that.
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Old 03-07-2009, 05:52 PM
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who on here had coolant in there trans fluid? i must have missed that.
Transmission / Radiator Failure

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Originally Posted by 2WD_NISMO View Post
Living in Florida, did you really want to do this? I have the Nismo, no tow package and I have the dual coolers, like you do. I thought all V-6s came like that.
What harm can it do? The big oil cooler is on all of the autos from the factory as you stated. One of the big selling points for the 05-up Frontier is the towing capacity. I'm sure that's why they added the additional cooler.
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Old 03-07-2009, 06:08 PM
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I spoke to the master service tech (30+ years experience) at my dealership about this issue regarding my '06 LE KC. He recommended I close this bypass and add a trans cooler after my 3yr/36000 mi warranty expired. So, this must be an issue with these trucks.
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Old 03-07-2009, 06:12 PM
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I spoke to the master service tech (30+ years experience) at my dealership about this issue regarding my '06 LE KC. He recommended I close this bypass and add a trans cooler after my 3yr/36000 mi warranty expired. So, this must be an issue with these trucks.
Add another one in addition to the factory cooler?
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Old 03-07-2009, 06:21 PM
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Is the cooler in front of the radiator a trans cooler? I'm not that educated in this area.
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