Transmission cooler

At The Helm · **Posted:** Sat Jun 18, 2011 1:10 am

So i did some towing this week (about 3500 lbs) and was a little worried about the trans temp when ascending grades. I don't tow very often and its usually short distances around town, but i may be moving from CA to Tulsa, OK and would pull a trailer. Would it be a good idea to install an auxilliary trans cooler and thermometer so i can monitor it? Factory warranty issues? I am also wondering what it would take to mount it behind the grille.

Mike08Liberty · **Posted:** Sat Jun 18, 2011 12:45 pm

If I remember correctly you have a trans cooler built into the radiator. You can get something like a ScanGauge to monitor the tranny temp but I don't think you'll have a problem with temp.

SETexasLibby · **Posted:** Sat Jun 18, 2011 6:10 pm

Mike08Liberty wrote:

If I remember correctly you have a trans cooler built into the radiator. You can get something like a ScanGauge to monitor the tranny temp but I don't think you'll have a problem with temp.

I think the Trans cooler only comes with the Factory tow package. I don't foresee you having any issues man, I've towed a travel trailer about 100miles at 4500 Pounds in 100plus heat last weekend and nothing happened.

Luny421 · **Posted:** Fri Jun 24, 2011 6:04 pm

on my '08 Sport, i've got the trans cooler (looks like a small radiator on the bottom front of the radiator), but no factory hitch, so i don't think they were only installed w/ the tow package. I could be wrong, it wouldn't be the first time...

DirtyKK · **Posted:** Fri Jun 24, 2011 6:14 pm

the small cooler in the opening of the front bumper is for the power steering. i dont have a tow package or trans cooler so i couldnt tell you where its located or looks like. so maybe i could be wrong...

mag03kj · **Posted:** Fri Jun 24, 2011 6:44 pm

SETexasLibby wrote:

Mike08Liberty wrote:

If I remember correctly you have a trans cooler built into the radiator. You can get something like a ScanGauge to monitor the tranny temp but I don't think you'll have a problem with temp.

I think the Trans cooler only comes with the Factory tow package. I don't foresee you having any issues man, I've towed a travel trailer about 100miles at 4500 Pounds in 100plus heat last weekend and nothing happened.

I dont know about the KKs but my 03 KJ has got a trans. cooler and it didnt come from the factory with tow package. Its not built in the rad. either.

hrogi · **Posted:** Fri Jun 24, 2011 7:08 pm

So we have a MiniVan Tranny and no Cooler?

Wow that bites

Luny421 · **Posted:** Fri Jun 24, 2011 7:25 pm

DirtyKK wrote:

the small cooler in the opening of the front bumper is for the power steering. i dont have a tow package or trans cooler so i couldnt tell you where its located or looks like. so maybe i could be wrong...

Taken from wikibooks (http://en.wikibooks.org/wiki/Jeep_Liberty/Transmissions):

"Jeep Libertys with the 42RLE transmission have an auxiliary transmission cooler in front of the engine radiator. Libertys with the 45RFE transmission have a cooler built into the engine radiator."

I'm pretty positive i've got the 42RLE with the trans cooler and no factory tow pkg

DirtyKK · **Posted:** Fri Jun 24, 2011 7:40 pm

Luny421 wrote:

DirtyKK wrote:

the small cooler in the opening of the front bumper is for the power steering. i dont have a tow package or trans cooler so i couldnt tell you where its located or looks like. so maybe i could be wrong...

Taken from wikibooks (http://en.wikibooks.org/wiki/Jeep_Liberty/Transmissions):

"Jeep Libertys with the 42RLE transmission have an auxiliary transmission cooler in front of the engine radiator. Libertys with the 45RFE transmission have a cooler built into the engine radiator."

I'm pretty positive i've got the 42RLE with the trans cooler and no factory tow pkg

hmm im half way across the world from my KK right now so i cant check. maybe there is a tranny cooler built into the radiator. im pretty sure i followed those lines from the front cooler and they went to the steering rack though. someone should go take a look at theres.

tjkj2002 · **Posted:** Fri Jun 24, 2011 8:33 pm

You have some sort of trans cooler.The standard KK trans cooler is intergrated with the AC condensor,if one leaks you have to replace as one unit.

At The Helm · **Posted:** Fri Jun 24, 2011 8:53 pm

Thanks everyone for the replies. I knew that i already had a trans cooler built in with the ac condenser after looking at Mopar's website. But my question was should I install an auxilliary trans cooler, or should the one be enough?

Mike08Liberty · **Posted:** Tue Jun 28, 2011 9:07 pm

The factory one should be plenty. I have yet to see a KK report a trans overheating problem from towing. Most trans issues are from over working in 4wd.

jmoomaw · **Posted:** Thu Jul 28, 2011 7:15 am

I am about to get my tranni rebuilt. I have 137,500 miles. Many of the last 50,000 included towing. This month, after 4 hours on the road hauling a tailer with lots of stop and goes, the tranni begins to have trouble shifting. My mechanic has recommended rebuilding for about 6 months when I have taken it in for other servicing.

The thermostat is not working and I notice it most during the winter. Does that keep the tranni cooling system from kicking in also?

teckn9ne · **Posted:** Fri Aug 05, 2011 10:09 pm

According to my build sheet my 2010 with out tow package it has NHBS Auxiliary Transmission Oil Cooler but does not show power steering cooler in build sheet.

SupeRBkk · **Posted:** Sun Aug 14, 2011 7:20 pm

Checkout this thread

http://www.jeepforum.com/forum/f292/201 ... r-1132216/

OG_Toucan · **Joined:** Tue Aug 09, 2011 11:16 pm **Posts:** 100

A little bit of a different vehicle, but I towed a 4500 lbs trailer from Auroa, OR to Phoenix, AZ with my Dads 03 KJ and had no issues what so ever. A little slow going through some of the passes but no mechanical issues what so ever.

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Transmission cooler

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