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Unread 06-18-2013, 12:42 PM   #31
Knuckelhead
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Quote:
Originally Posted by roosr View Post
As for the fan clutch, if there is no airflow through the radiator, it'll be running at a higher temp & radiating the heat which engages the fan clutch. So the under hood temps do have an effect. Absolutely no way that the under hood temps CAN'T have a factor because it's heat that engages the clutch to run the fan.
If you have no air flow through your radiator, you have bigger problems.

Again, the fan clutch is controlled by the temperature of the air coming through the radiator, not under hood temperatures.
Quote:
Originally Posted by RowJ View Post
Dealers still have separate PN# for manual vs automatic. Not just one size fits all.
Radiator for manuals has no ATF cooling tank on the bottom. 100% of cooling fins work on coolant.
The ATF cooling/heating takes place in the lower radiator tank. All the fins in both radiators cool the engine coolant. The OEM radiator for an automatic transmission equipped TJ fits and cools the same for a TJ with a manual transmission...

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Unread 06-18-2013, 01:34 PM   #32
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Quote:
Originally Posted by Jerry Bransford View Post
My previous TJ came from the factory with a 5-speed manual transmission & a radiator with an auto transmission cooler.
Interesting.... all I can say is Dealership showed me there are two different part #'s ..... for my 98.
One for automatics....one for manuals.
Quote:
Originally Posted by Knuckelhead View Post
I.... The OEM radiator for an automatic transmission equipped TJ fits and cools the same for a TJ with a manual transmission...
I know it fits. Most companies only make one PN for all early TJ's.
As to cooling the same.... I'll get back to you on accepting that one.
Having hot AFT next to cooled down coolant seems to me to make at least a minor difference!*

RJ
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Unread 06-18-2013, 01:46 PM   #33
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Quote:
Originally Posted by RowJ View Post
As to cooling the same.... I'll get back to you on accepting that one.
Having hot AFT next to cooled down coolant seems to me to make at least a minor difference!*
Where would the ATF be coming from in a TJ with a manual transmission?...
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Unread 06-18-2013, 01:58 PM   #34
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I was speculating that all other things being equal, coolant leaving an auto radiator might be hotter than coolant leaving a manual equipped TJ radiator.

But I'm also curious to see if cooling fin area on an auto radiator is same as on a manual radiator.
JUst don't know but will find put when I get home.

RJ
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Unread 06-18-2013, 02:01 PM   #35
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Quote:
Originally Posted by RowJ View Post
Interesting.... all I can say is Dealership showed me there are two different part #'s ..... for my 98.
One for automatics....one for manuals.

I know it fits. Most companies only make one PN for all early TJ's.
As to cooling the same.... I'll get back to you on accepting that one.
Having hot AFT next to cooled down coolant seems to me to make at least a minor difference!*

RJ
Quote:
Originally Posted by Knuckelhead View Post
Where would the ATF be coming from in a TJ with a manual transmission?...
even if its an auto, if your ATF fluid is hotter than your coolant, you have other issues
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Unread 06-18-2013, 02:08 PM   #36
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Quote:
Originally Posted by Ironhead View Post
even if its an auto, if your ATF fluid is hotter than your coolant, you have other issues
My ATF sometimes gets hotter than my coolant with the AC on and sitting in stop and go traffic. Very normal.
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Unread 06-18-2013, 02:11 PM   #37
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Quote:
Originally Posted by RowJ View Post
If you went OEM...from Dealer.... it was not cheap! But it is probably the best...for manual trannys at least.
Dealers still have separate PN# for manual vs automatic. Not just one size fits all.
Radiator for manuals has no ATF cooling tank on the bottom. 100% of cooling fins work on coolant.
Suggested Retail is $285.00.
I went with the OEM PART and installed it myself. Spent about $100 and took about an hour. Better than the $500 I was quoted.

PS, mine had an ATF cooling tank but I just ignored that.
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Unread 06-18-2013, 02:13 PM   #38
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Originally Posted by lunchbox704 View Post
I went with the OEM PART and installed it myself. Spent about $100 and took about an hour.
You need to understand the difference between OE style and OEM.
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Unread 06-18-2013, 02:14 PM   #39
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Originally Posted by lunchbox704 View Post
I went with the OEM PART and installed it myself. Spent about $100 and took about an hour. Better than the $500 I was quoted.

PS, mine had an ATF cooling tank but I just ignored that.
It's not a cooling tank. It's just a coiled tube located in the bottom of the cooling tank of the radiator..
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Unread 06-18-2013, 02:15 PM   #40
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Originally Posted by JBTJ View Post
My ATF sometimes gets hotter than my coolant with the AC on and sitting in stop and go traffic. Very normal.
sounds like you need an external trans cooler
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Unread 06-18-2013, 02:20 PM   #41
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OEM is my vote. i replaced mine with an "OEM STYLE" and it ran hotter than my real OEM with a bad leak. how much dust do you get in AZ. i tested my air flow of my old oem and realized it was gunked up pretty bad. i started noticing that everything under the hood would be nasty after i washed it. so i pulled the radiator, plugged it, and left it in some water over night. i came out to a small mud puddle the next morning. so i put my power washer on its lowest setting and washed the radiator in the opposite direction of the air flow. the amount of mud that ended up on my driveway was shocking, and that radiator has never seen mud...just dusty trails.

oh and now my OEM radiator works a lot better. keeps the engine cool and my fan isnt lugging all the time. the results were better running temps, more power and better MPG. I now pull and wash my radiator everytime i change my air filter.
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Unread 06-18-2013, 02:21 PM   #42
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Originally Posted by Ironhead View Post
sounds like you need an external trans cooler
Yeah, maybe. But it's been doing fine for 12 years and 142k miles.
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Unread 06-18-2013, 02:24 PM   #43
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Originally Posted by biffgnar View Post
You need to understand the difference between OE style and OEM.
I do understand the difference, thank you.
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Unread 06-18-2013, 02:29 PM   #44
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Quote:
Originally Posted by lunchbox704 View Post

I do understand the difference, thank you.
Link for OEM radiator for $100?
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Unread 06-18-2013, 02:29 PM   #45
RowJ
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Quote:
Originally Posted by Ironhead View Post
even if its an auto, if your ATF fluid is hotter than your coolant, you have other issues
We're talking about cooled down coolant.... from the bottom of the cooling tubes/fins!
Not sure what that temp is but well below 200*

I'm starting to feel like we are beating this subject to death!
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