Trans oil flow direction to cooler?
96 XJ 4.0L and AW4 transmission. Internal radiator oil cooler.
Does the oil enter the top radiator fitting or the bottom fitting? Thanks. |
It goes in the bottom and out the top.
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Originally Posted by 00t444e
(Post 3555575)
It goes in the bottom and out the top.
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AFAIK, most transmissions take fluid from the torque converter drain and send it to the cooler and the cooled fluid is returned to the pan. The "Hot" line is generally the one closest to the front of the transmission, although it's sometimes not obvious which is which. Most of the heat generated in automatic transmissions is from the converter.
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The outlet (front) line on my '96's AW4 connects to the top of the radiator's trans cooler.
Seems I'm not the only one whose noticed this: https://www.cherokeeforum.com/f2/aw4...rences-250407/ |
Originally Posted by EZEARL
(Post 3555599)
The outlet (front) line on my '96's AW4 connects to the top of the radiator's trans cooler.
Seems I'm not the only one whose noticed this: https://www.cherokeeforum.com/f2/aw4...rences-250407/ IDK either. Maybe internally it goes straight down and fills from the bottom. Maybe it is only located 'higher' for packaging purposes. IDK, never pulled the end cap off a radiator to actually look and see. Sometimes things are not how they look or seem. |
GOOD point. But alas my old radiator doesn't reside here any longer so I can't check it out. I do know that Spectra part #'s are the same for all XJ's except for ones with the closed cooling system ( I checked '90,'95,'96,and 2000). So if there was/is an internal difference in OEM ones I've had no issues with my '96 hooked up to a Spectra one.
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There's a coil of tubing inside a piece of pipe inside the radiator tank. The pipe helps radiate the oil's heat to the coolant. It shouldn't get an air blockage because any air will be sent back it the trans pan.
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Makes sense.
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Originally Posted by EZEARL
(Post 3555599)
The outlet (front) line on my '96's AW4 connects to the top of the radiator's trans cooler.
Seems I'm not the only one whose noticed this: https://www.cherokeeforum.com/f2/aw4...rences-250407/ |
My thoughts on the aux cooler is it should be plumbed in before the radiator so it gets rid of some heat before it warms up the coolant. Just my opinion.
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Originally Posted by dave1123
(Post 3555864)
My thoughts on the aux cooler is it should be plumbed in before the radiator so it gets rid of some heat before it warms up the coolant. Just my opinion.
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If you have the cooler before the radiator when it's hot, you would be heating the transmission fluid up after its been cooled by the cooler. The hot tranny fluid going to the radiator first isn't a problem for the cooling system, it was designed that way.
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Originally Posted by 00t444e
(Post 3555828)
I just checked my 97 to verify and the front outlet line goes in on the bottom port of the radiator I have my aftermarket cooler plumbed in after the radiator. They must have changed it for the 97 model, mine also came with the factory auxiliary cooler I am not sure if that is a factor or not.
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