Beating a Dead Horse - Page 2 - Nissan Frontier Forum
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#11 (permalink) Old 12-10-2012, 09:54 PM
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TXPRO4x, the manual transmission in our trucks does not contain a transmission cooler as the manual transmission does not have pumps like an auto tranny does.

If I were in your position with being paranoid I'd get a solid aftermarket tranny cooler and install it. The warming up issue of an automatic is the only problem you'd encounter and that isn't even really a problem, it'd just take a little longer driving to warm it up instead of letting your truck idle and help warm it up(that's howit works on our stock auto trannys). Heat is the number one killer of transmissions, doing the bypass will in my opinion give you peace of mind on all fronts(especially towing).


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#12 (permalink) Old 12-10-2012, 09:59 PM
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The radiator doesn't cool the tranny fluid... it runs through the radiator to warm it to operating temp.
If you're that worried about it, add an electric fan to the trans cooler and call it a day. Should work just fine.

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#13 (permalink) Old 12-11-2012, 01:03 AM
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Quote:
Originally Posted by noob View Post
Did some one say ... I mean type : The water-to-water trans cooler ( in the radiator ) cools the trans fluid *better* than the air-to-water one ?

Question: At what climate/ambient air temp does that occur ?
no i meant to say the 2 combined are better than 1 alone.....

oh and it will be better cooling in low speed high torque situations...airflow is not a given......

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Last edited by maineiac; 12-11-2012 at 03:08 AM.
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#14 (permalink) Old 12-11-2012, 09:34 AM
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Quote:
Originally Posted by feyded View Post
TXPRO4x, the manual transmission in our trucks does not contain a transmission cooler as the manual transmission does not have pumps like an auto tranny does.
FWIW, there are Nissan manual transmission applications that use an external pump and fluid/air coolers and the same could be said for differential coolers. But by and large, I'd agree 99% of M/T's do not have or need such a system & there aren't internal pumps on most if not all M/T's.

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The radiator doesn't cool the tranny fluid... it runs through the radiator to warm it to operating temp.
If you're that worried about it, add an electric fan to the trans cooler and call it a day. Should work just fine.
IMHO, it does both. When cold, the radiator serves to warm the fluid, and when the trans fluid temp becomes higher than the coolant, it serves to cool it, albeit not as much as a fluid/air cooler. Setups like this are usually referred to as 'heat exchangers' just like sandwich style oil coolers.

Also, FWIW, for those speaking of the differences between styles of coolers, the first word in the expression is where the heat is coming *from*, and the latter is where it's being transferred *to*.

In this example;

Fluid/fluid would express trans fluid to coolant.

Fluid/air trans fluid to the air, a small radiator style finned cooler that the fluid circulates through.

Lots of people use fluid/air coolers with no problems, but an engineer *might* argue to the contrary if the fluid doesn't reach "optimum designed temp."

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#15 (permalink) Old 12-11-2012, 09:59 AM
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Quote:
Originally Posted by HeavyDuty View Post
FWIW, there are Nissan manual transmission applications that use an external pump and fluid/air coolers and the same could be said for differential coolers. But by and large, I'd agree 99% of M/T's do not have or need such a system & there aren't internal pumps on most if not all M/T's.



IMHO, it does both. When cold, the radiator serves to warm the fluid, and when the trans fluid temp becomes higher than the coolant, it serves to cool it, albeit not as much as a fluid/air cooler. Setups like this are usually referred to as 'heat exchangers' just like sandwich style oil coolers.

Also, FWIW, for those speaking of the differences between styles of coolers, the first word in the expression is where the heat is coming *from*, and the latter is where it's being transferred *to*.

In this example;

Fluid/fluid would express trans fluid to coolant.

Fluid/air trans fluid to the air, a small radiator style finned cooler that the fluid circulates through.

Lots of people use fluid/air coolers with no problems, but an engineer *might* argue to the contrary if the fluid doesn't reach "optimum designed temp."
How much piping inside the radiator does the transaction fluid run through? My impression was just the 1 from end to end before it flows back out again.

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#16 (permalink) Old 12-11-2012, 11:06 AM
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I'd say its a no brainer about doing the bypass. Not a single person has had a legit complaint just having the factory front trans cooler only. My best friend has a 05 nismo with 185k on it and bypassed the orig cooler well over 100k miles ago and stil has the orig radiator that evidently isn't leaking. He tows in the jersey shore in 100deg summer heat and upstate NY usualy carting a 20ft seadoo twin engine jetboat with NO problems. My old 92 pathfinder had a problem wiht the radiator trans cooler clogging so i added an external trans cooler since it didn't have one and i have 238k on it right now and climbing. I PERSONALLY bought a 06 LE frontier with the cross contamination issue and it was cheap. I flushed 26 quarts of atf through the trans half at first then drove 100 miles and flushed the rest through and the trans is fine. I replaced the radiator and bypassed the cooler but surely didn't have to since the rad was new. I think too many people drive their trucks and feeling the shuddering during the contamination issue and ruin the trans. If cought semi early (say within 500-1000 miles) a good flush and you should be fine. I used a seafoam trans clean during the first flush and lucas shift treatment NOT stop slip the second time around and truck is perfect at 174k miles. Bypass your rad cooler and enjoy your trucks!

Scott
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#17 (permalink) Old 12-11-2012, 12:29 PM
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Quote:
Originally Posted by JettyLife View Post
How much piping inside the radiator does the transaction fluid run through? My impression was just the 1 from end to end before it flows back out again.
Not much, the internal tube style are varying diameters of ~5/8" to 1" and are 6-8-10" long. The lesser expensive radiators use these, where the better rads use larger, more expensive plate style coolers (more surface area to dissipate heat than a single pass hollow tube.)

Someone had a link to a cutaway Griffin video, I couldn't find it.

Some applications (Delphi comes to mind) use an internal trans cooler on one side and an engine oil cooler on the other.

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#18 (permalink) Old 12-11-2012, 01:45 PM
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Quote:
Originally Posted by HeavyDuty View Post
Someone had a link to a cutaway Griffin video, I couldn't find it.
This one...

Nissan Transmission Cooler Comparison - YouTube

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#19 (permalink) Old 12-11-2012, 06:14 PM
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Nissan, and virtually all other maufacturers, just put auto tranny coolers in there to add to their costs.
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#20 (permalink) Old 12-12-2012, 01:04 AM
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Speedbuggy, your right and although, not what I was planning on doing, it makes perfect sense. I'm gonna do the bypass this next weekend and not look back. Why trade a truck that's been perfect to me since day one?

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