I by-passed my in radiator tranny cooler

goblue90 · Postby **goblue90** » Wed Mar 23, 2011 6:08 am

08Datsun wrote:
goblue90 wrote:Thanks 08Datsun. Do you think I should just add the B&M cooler and fan in series with the existing external transmission oil cooler or just replace the OEM cooler?
That really depends on how hard you're going use it. You already said you don't tow. Off-roading is the other thing that builds a lot of heat and in my experience, is even harder on a tranny.

I know that the 05-07s have the power steering cooler on the driver's side, right where you'd want to put the extra cooler. That's something you'd have to deal with to add the second cooler. The '08+ have the factory cooler on the driver's side, and the power steering cooler down below. I just added the extra cooler and fan to the passenger's side. I thought this might block too much airflow to the radiator, but so far it has not run any hotter.

Thanks, I appreciate the input! I'll post pics after I install it.

WheatBread · Postby **WheatBread** » Tue Apr 05, 2011 7:28 am

it would be interesting to see results from a non bypassed tranny in those same conditions

i-man · Postby **i-man** » Tue Apr 05, 2011 6:07 pm

I went to do this mod the other day, but stopped. The short hose goes to the passenger side of the radiator. But there wasn't a long hose going to the drivers side of the rad. Instead, the hose coming out of the drivers side of the rad went to the top of the aux cooler. then the hose coming out of the bottom of the cooler ran to the passenger side and back into the tranny. Any ideas on what that is all about?

WheatBread · Postby **WheatBread** » Wed Apr 06, 2011 5:21 am

that doesn't make sense, from rad to cooler and from cooler to tranny?

i-man · Postby **i-man** » Wed Apr 06, 2011 5:27 am

As best I could tell, that's how it is running.

WheatBread · Postby **WheatBread** » Wed Apr 06, 2011 7:11 am

look at where the line going to the tranny is, there should be another line right next to it , where does that go?

i-man · Postby **i-man** » Wed Apr 06, 2011 8:18 am

One goes to the passenger side of the rad, the other goes around the passenger side of the rad and runs to the cooler.

WheatBread · Postby **WheatBread** » Wed Apr 06, 2011 12:25 pm

what year is it?

i-man · Postby **i-man** » Wed Apr 06, 2011 2:21 pm

08Datsun · Postby **08Datsun** » Wed Apr 06, 2011 6:47 pm

i-man wrote:2008

2008+ is different, as you found. I bypassed mine a long time ago with a second cooler and a fan. I search every so often to see if I can find a 2008 with the radiator cooler problem, but I haven't seen one.

i-man · Postby **i-man** » Wed Apr 06, 2011 7:30 pm

That's good to know,,,,but I'm still gonna do the mod.

08Datsun · Postby **08Datsun** » Wed Apr 06, 2011 8:31 pm

i-man wrote:That's good to know,,,,but I'm still gonna do the mod.

Well, easiest way is to take both hoses off the radiator cooler and connect them with a short length of new hose.

As you noticed, the output for the radiator cooler wraps around the driver's side on ours on its way to the auxiliary cooler, which is on the driver's side '08+. If you re-route that hose from the rear of the radiator to the front so that the inlet from the tranny wraps around the passenger side like the 05-07's, you'll find it easy to add a second cooler, if you are so inclined.

i-man · Postby **i-man** » Wed Apr 06, 2011 8:46 pm

08Datsun wrote:
i-man wrote:That's good to know,,,,but I'm still gonna do the mod.
Well, easiest way is to take both hoses off the radiator cooler and connect them with a short length of new hose.

As you noticed, the output for the radiator cooler wraps around the driver's side on ours on its way to the auxiliary cooler, which is on the driver's side '08+. If you re-route that hose from the rear of the radiator to the front so that the inlet from the tranny wraps around the passenger side like the 05-07's, you'll find it easy to add a second cooler, if you are so inclined.

That sounds like a good plan. I would like to add another cooler, with a fan and a thermostat, just for my piece of mind. I do tow, from time to time, and it is usually in the mountains.
Thanks for the advice.

Postby **mar1** » Wed Apr 06, 2011 9:14 pm

i-man wrote:2008

i have the 2008. reroute not needed.

i live in a country with summers reaching 130F, and i offroad to the extent the engine cries.. no issues at all with tranny.

volvite · Postby **volvite** » Wed Apr 06, 2011 10:54 pm

Now your talking that the 08+ you have not seen any issues with the radiator? That's good to know. How about with the V8, 5.6Ls? Seen problems with those?

I by-passed my in radiator tranny cooler

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