2 Trans. coolers?
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Post Fiend
Joined: Nov 2008
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From: McKenzie River
2 Trans. coolers?
Replaced the stock "stacked plate" trans cooler w/ 16"x12" hayden cooler last year, I was told the are famous for plugging up and not great coolers. Question is: I now came possesion of almost identical cooler to the one I installed last year, can I run both?, or will this cause problems in cold weather or otherwise? Truck is 93 f350 460/e4od 2wd SC.
Super Moderator
Joined: Apr 2004
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Two is overkill. It's not like you're in Death Valley. Does your fluid run through the aux. cooler, then to the one in the radiator, then back to the trans? If so, that should keep the oil at the right temp. Too hot is bad, too cold is no good either.
If you are not running back to the radiator, a thermostat valve/bypass set up might be wise.
You may also consider a filter in the line.
If you are not running back to the radiator, a thermostat valve/bypass set up might be wise.
You may also consider a filter in the line.
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Post Fiend
Joined: Nov 2008
Posts: 23,849
Likes: 20
From: McKenzie River
Yes its also running thru the rad. cooler as well. stock except for changing from stock aux. cooler to the hayden cooler. I suspected it might be overkill, guess I will put it on the ranger!.............thanks for the info!
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,658
From: SE Florida
Does your fluid run through the aux. cooler, then to the one in the radiator, then back to the trans? If so, that should keep the oil at the right temp. Too hot is bad, too cold is no good either.
If you are not running back to the radiator, a thermostat valve/bypass set up might be wise.
If you are not running back to the radiator, a thermostat valve/bypass set up might be wise.
Super Moderator
Joined: Apr 2004
Posts: 34,503
Likes: 2,820
My theory here is IF the aux trans cooler is overdoing it on a cold day, going back the radiator based cooler will bring the temp into the proper range.
How could it not do otherwise? It is using engine-temp coolant to cool the trans fluid. If the trans fluid is colder than the engine coolant, it would heat it up, wouldn't it?
Am I missing something?
Thanks.
How could it not do otherwise? It is using engine-temp coolant to cool the trans fluid. If the trans fluid is colder than the engine coolant, it would heat it up, wouldn't it?
Am I missing something?
Thanks.
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
Will the coolant temp will ever rise faster than the atf temp?THAT is the question.Not sure but I think the trans will make enough heat on its own, without pulling any from the motor. Aux trans cooler instructions say to rad first then aux cooler, IIRC
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
My theory here is IF the aux trans cooler is overdoing it on a cold day, going back the radiator based cooler will bring the temp into the proper range.
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Cargo Master
Joined: Jun 2003
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From: Somewhere Saskatchewan
Right
That is a common misconception that the fluid must be reheated.
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,730
Likes: 2,658
From: SE Florida
My theory here is IF the aux trans cooler is overdoing it on a cold day, going back the radiator based cooler will bring the temp into the proper range.
How could it not do otherwise? It is using engine-temp coolant to cool the trans fluid. If the trans fluid is colder than the engine coolant, it would heat it up, wouldn't it?
Am I missing something?
Thanks.
How could it not do otherwise? It is using engine-temp coolant to cool the trans fluid. If the trans fluid is colder than the engine coolant, it would heat it up, wouldn't it?
Am I missing something?
Thanks.
The transmission cooler is in the cold side of the radiator. That's the side where the radiator has already cooled the engine coolant. When the truck is working hard on a hot day this side of the radiator is only about 15-20F colder than the engine temperature. But when the engine is working hard, so is the trans, so it was hotter than the engine! On a cold day, especially if the truck is empty, the cold side of the radiator stays within a few degrees of ambient air temperature. So if it's -10F outside, this side of the radiator may only be around 0F. And that's after the engine is fully warmed up!
None of this is specualation on my part. I've run tests from +115F to -40F ambient temperatures. I had 40-50 thermocouples on the trucks/cars I tested to be able to know the temperatures at many places. I could never find ANY condition where the radiator warmed the ATF. It just doesn't happen.
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