Auxiliary Transmission Cooler Install

[bargainhuntr]

Planning on installing an aux tc in 2008 LE. Does anyone know for sure which line is which coming from the factory tc. I beleive the bottom line is the exit from rad, return to tranny...Any thoughts

[datsa noydb]

I asked that same question a couple of months ago.

The few that bothered to reply could not remember which way the fluid was flowing.

I have a cooler sitting at home waiting for me, so I will find out a a few weeks
which way the fluid flows when I install my own cooler.

If you find out before then, please let us know.

.

[Narboza]

From the U660E/U660F/U760E documentation in the 2011 Repair Manual, and looking at the front of the transmission:

The "NO. 1 OIL COOLER OUTLET HOSE" is up and to the left of the inlet hose. It exits the transmission towards the radiator.

The "NO. 1 OIL COOLER INLET HOSE" is down and to the right of the outlet hose. It exits the transmission towards the passenger side of the vehicle.

See the attached pictures.

[brian_bp]

I didn't answer this question in this thread or the earlier case, simply because I have not yet had any interest in adding a transmission cooler and didn't know the answer... it's not about "bothering" to reply.

I still have no information to add; I just wanted to say thanks to Narboza for an exceptionally clear and helpful post.

[Narboza]

I wanted to add that the teminology is straight out of the repair manual. On our Limited, the two transmission hoses connect to the cooler in the bottom radiator tank.

[wiswind]

Just in case one reads this that has a 1998-2003 Sienna.
The line on the passenger side, going into the passenger side of the radiator is the hot fluid OUT from the transmission.
The fluid flows through the in-radiator cooler, then through the auxillary cooler, then back INto the transmission through the hose on the driver's side.

Note, the radiator fans are removed in this picture.



THIS is where I mounted the cooler on the front of the condenser coils.


THIS is the cooler that I bought.
I also added the Magnefine filter to the cooler hose going INto the transmission.

[datsa noydb]

OK, now we have information on Gen. 1 and Gen. 3.

I will look in my Gen. 2 manual to see if there are any words of wisdom in the transmission section.
(I have been looking in the radiator section and not found anything. )

.

[Narboza]

Here is a 2005 Repair Manual picture.

SST = Special Service Tool

[datsa noydb]

Narboza, I have been looking in my manual for that picture to see what else is around it for commentary.

I have looked in Lubrication, Cooling and other sections, please tell me the trail you followed, and to what specific section.

.

[Narboza]

I have an electronic copy of the 2011 manual so I just searched for "cooler" and found it in the transmission section. Those are the pictures from earlier in the thread. For the 2005 manual, that is a PDF screen capture from Section 23 - Automatic Transmission Transaxle, page 40-10 in the transmission replacement procedure. I knew where to look from the 2011 manual.

[datsa noydb]

Found it, thanks.

I think the easiest place to connect the aux. cooler is near the bottom of the driver's side of the radiator. Both of the fittings there almost beg to have their hoses re-routed, so I was going to indulge them at some point. Just needed to see which one was coming out of the radiator and going back to the tranny, so I could intercept there and re-route to the cooler. Now that I can see which one is which, according to the manual, I should have no trouble following the lines from the tranny to the radiator and disconnecting (what I hope is) the correct one.

When I finally get to it, there will, of course, be pictures. :o

.

[dlbalt]

Does anyone know for sure which line is which coming from the factory tc. I beleive the bottom line is the exit from rad, return to tranny...Any thoughts

The cold return from any radiator is almost always at the bottom, for the simple reason that cold fluids sink and hot ones rise.

[wiswind]

On my 2003, they are both at the very bottom of the radiator assembly.
On my Ford Windstar, the cooler was mounted inside the passenger side, side tank......hot fluid in the top, cool fluid out the bottom.

I mounted my auxillary cooler toward the top of the front of the condensor coils as shown in my earlier post.
The reason for this is to get less stone strikes over time.
It is important to route the hoses so that nothing is hanging down to catch, and none of the hoses are rubbing against anything sharp and/or hot......and no turns in the hose that are sharp enough to kink the hose.

[Lone-Ranger]

Is there a size limitation in what can go in, im not trying to fit a big one but i also dont want to fit one thats next to a useless small one?

[wiswind]

I got the 4452 that is for GVW of 14,500 pounds.
They show a kind of guide on THIS website http://www.bulkpart.com/Merchant2/me...e=tru-cool-lpd

I felt that this was a good size for my 2003 Sienna.
NOTE that the guide is intended for when the cooler is used as an AUXILARY cooler....in ADDITION to the factory in-radiator cooler.

You would also want to check to see if your Sienna already has the factory AUXILARY cooler....which would be located inside the fender on the driver's side....in front of the front tire, below the headlight.
You would see the cooler line from the bottom, driver's side go to the driver's side fender if you have the factory auxilary cooler.
If you do not have the factory auxilary cooler, the hose from the bottom of the radiator, driver's side will go DIRECTLY to the transmission.