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Bigger transmission cooler, will it run hotter? #4813487
07/13/18 07:06 PM
07/13/18 07:06 PM
Joined: Feb 2013
Posts: 11,075
Phoenix, AZ
Nick1994 Offline OP
Nick1994  Offline OP
Joined: Feb 2013
Posts: 11,075
Phoenix, AZ
I'm thinking about installing a bigger transmission cooler on my Jeep, it has a factory one but it's the cutest thing you ever saw. It's a common upgrade, but I worry about airflow for the radiator. My Jeep runs pretty hot at low speeds, 230 degrees or so. I'm concerned that putting a big transmission cooler on it will reduce radiator air flow, and might make it run hotter.

Is this possible?

BTW, the entire cooling system has been replaced, not concerned with that.


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813489
07/13/18 07:18 PM
07/13/18 07:18 PM
Joined: Jul 2005
Posts: 30,952
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,952
NY
Originally Posted By: Nick1994
I'm thinking about installing a bigger transmission cooler on my Jeep, it has a factory one but it's the cutest thing you ever saw. It's a common upgrade, but I worry about airflow for the radiator. My Jeep runs pretty hot at low speeds, 230 degrees or so. I'm concerned that putting a big transmission cooler on it will reduce radiator air flow, and might make it run hotter.

Is this possible?

BTW, the entire cooling system has been replaced, not concerned with that.

At low speeds it is. I recall helping my brother install one years ago on his pick up truck for towing the boat. In traffic [boat not in tow] the engine actually ran hotter, with the boat is was worse. Moving along at normal driving speeds it was fine. I have a feeling that is what might happen to your Jeep.


God Bless Our Troops

Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813495
07/13/18 07:27 PM
07/13/18 07:27 PM
Joined: Sep 2014
Posts: 2,175
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,175
US-WA
Grab yourself the 2.5L clutch fan, and your low speed worries are over. It will sound like a semi truck, but the cooling will be significantly improved. Threw one on my 4.0, and my electric fan is forgotten. Even with the top of the shroud broken, there is a big improvement in air flow.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 103K Napa 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 35k PP MIX, NG7047
Re: Bigger transmission cooler, will it run hotter? [Re: Dyusik] #4813505
07/13/18 07:41 PM
07/13/18 07:41 PM
Joined: Feb 2013
Posts: 11,075
Phoenix, AZ
Nick1994 Offline OP
Nick1994  Offline OP
Joined: Feb 2013
Posts: 11,075
Phoenix, AZ
Originally Posted By: Dyusik
Grab yourself the 2.5L clutch fan, and your low speed worries are over. It will sound like a semi truck, but the cooling will be significantly improved. Threw one on my 4.0, and my electric fan is forgotten. Even with the top of the shroud broken, there is a big improvement in air flow.
Already have one, thanks.


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813515
07/13/18 08:01 PM
07/13/18 08:01 PM
Joined: Sep 2014
Posts: 2,175
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,175
US-WA
Now I don't know how good of a cooler you can cram, but if I was desperate to get my temps down I would get a low profile wide cooler into the space allocated for the optional OEM winch. You can mangle up the center portion of the bumper to get air flow, or put fans on it, but you would be limited on fan choices there I would imagine.

Now this is a non-hillbilly option, you could always grab a window unit A/C, gut the innards and plumb the ATF to run where the R410 did thumbsup
If only you were not in AZ, you could convert the A/C to OBA (it is one of the most easy and useful mods ever), and use the A/C condenser for the cooling.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 103K Napa 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 35k PP MIX, NG7047
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813518
07/13/18 08:04 PM
07/13/18 08:04 PM
Joined: Apr 2010
Posts: 4,545
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,545
Storrs, Connecticut
I have a B&M cooler on my Jeep. If you run the cooler so it is separate from the radiator heat exchanger, your coolant temps might actually be cooler. The AW4 transmission runs fairly hot, and the factory setup is to run it through a heat exchanger in the radiator and then through the tiny cooler you have for specific option packages. Since you live in AZ, you don't need the heat exchanger which essentially warms the transmission fluid for cooler climates.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (35k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813547
07/13/18 08:41 PM
07/13/18 08:41 PM
Joined: Mar 2012
Posts: 1,360
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,360
San Antonio, TX
No experience with jeep but they make those heat sink type coolers I’ve seen on land rovers. They are long and look like they’d dissipate a lot of heat for the size. If I had an automatic transmission I might think about doing that. I might do something for the new to me Buick. Just haven’t taken a look yet.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813563
07/13/18 09:01 PM
07/13/18 09:01 PM
Joined: Apr 2008
Posts: 12,973
Onondaga County
Miller88 Offline
Miller88  Offline
Joined: Apr 2008
Posts: 12,973
Onondaga County
I have a pretty large (5 row?) transmission cooler on my Cherokee along with another transmission cooler for the power steering fluid. No over heating issues. I was off roading with it in 100 degree heat and it never went above 210.


18 Forester 2.5I 6M
00 Jeep Cherokee
01 Ford F-350 XL 4x4 5M
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813671
07/14/18 03:30 AM
07/14/18 03:30 AM
Joined: Jun 2005
Posts: 5,274
North Texas
ARB1977 Offline
ARB1977  Offline
Joined: Jun 2005
Posts: 5,274
North Texas
You can also add a bigger transmission pan for more capacity.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
Re: Bigger transmission cooler, will it run hotter? [Re: ARB1977] #4813678
07/14/18 04:11 AM
07/14/18 04:11 AM
Joined: Jul 2005
Posts: 30,952
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,952
NY
Originally Posted By: ARB1977
You can also add a bigger transmission pan for more capacity.

Those work pretty well. The location of the transmission cooler is important, if it interferes with part of the radiator it can cause engine temps to rise, which I believe was the case with my brother's. In a location where it doesn't it can lower operating temps. I didn't make that clear in my last post. It was a long time ago when we messed with it.

OT-I installed grill inserts in my Rubicon to protect the radiator. Some people swear they don't cause them to run hotter. Not so in my case I took them out, temps in the summer in traffic climbed higher and faster. It went back to normal removing them. Maybe those swearing they didn't cause them to run hotter didn't have the EVIC. shrug


God Bless Our Troops

Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813706
07/14/18 06:19 AM
07/14/18 06:19 AM
Joined: Nov 2011
Posts: 1,230
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,230
Lyndhurst NJ
Unless your trans cooler is half as big as the rad or larger, I dont think itll cause too much of an issue with engine temps rising. The hot air from the AC condenser would probably create more heat than the trans cooler. Usually typical trans coolers are probably the size of a smaller book, if you can tuck that low or off to the side you should be able to fit it without any issues. Ive seen Jeeps come in that have the cooler attached to the frame rail for protection from rock etc when offroading, and it made a huge difference, even not being in the front of the car. Radiant cooling can make a difference.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813730
07/14/18 06:54 AM
07/14/18 06:54 AM
Joined: Aug 2003
Posts: 13,137
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,137
NE,Ohio
whole cooling system replaced? what radiator did you use? Some of the aftermarket ones will make it run hotter.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813789
07/14/18 08:47 AM
07/14/18 08:47 AM
Joined: May 2012
Posts: 5,655
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,655
Fort Lauderdale, FL
Given that your engine runs very hot for no good reason at all, I'd be hesitant to call it one way or another.


07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4813806
07/14/18 09:08 AM
07/14/18 09:08 AM
Joined: Jun 2014
Posts: 2,002
IL
Vern_in_IL Offline
Vern_in_IL  Offline
Joined: Jun 2014
Posts: 2,002
IL
Just need to add some Water Wetter additive to coolant. 20 degrees cooler with additive alone. Or try Purple Ice, Bath Salts.

Last edited by Vern_in_IL; 07/14/18 09:10 AM.
Re: Bigger transmission cooler, will it run hotter? [Re: Nick1994] #4814487
07/15/18 06:51 AM
07/15/18 06:51 AM
Joined: Dec 2006
Posts: 1,784
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,784
NY, NY
Don't turn your nose up at the small factory cooler. I bought an OEM cooler to add to the in radiator cooler on my Suburban. When it came, I almost sent it back and bought a B&M or something. I called a friend who owns a transmission shop and he told me the OEM ones are extremely efficient and work really well.
Turns out, he was right. Trans is much cooler than before and my trans oil lasts much longer than before the cooler install.
You'd never believe it based on the physical size of the cooler.

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