Beating a Dead Horse - Nissan Frontier Forum
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#1 (permalink) Old 12-10-2012, 01:39 PM
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Beating a Dead Horse

I know there has been numerous threads in regards to the Transmission/Radiator Contamination, but I needed some information in regards to the updated radiators.

I bought my 2010 PRO-4X CC auto December of 2010 with 21999 miles on it. My truck currently has 72XXX miles on it. I absolutely LOVE my truck, it has not given me a single problem in the 2 years i've had her. Not a check engine light, NOTHING.

When I purchased the truck I also purchased a Security + Preferred RS warranty 72 months/100,000 miles. My plan is once the truck is out of warranty, either 1. Trade it in for a new 6 speed manual (although I absolutely love the black leather, they don't make the 6 speeds with leather) or replace the radiator even if it hasn't broken yet with another.

My question is on whether I decide to just change out the radiator and keep the truck. I've seen people talk about Griffin radiators, the bypass etc. I don't want to do the bypass at all. What radiator out there IF ANY can I purchase that is designed in a way that WILL NOT contaminate my transmission. I've seen the youtube videos of the guys that say that there design is BETTER, but no where have I seen of a radiator that I can purchase that will not do this AT ALL.

I understand that my transmission could break from other things, such as no tranny fluid or abuse etc and my radiator could break from a crack or no fluid etc, but i have yet to find a radiator that is designed not to contaminate my transmission.

Can someone help me out and point me in a direction where I can purchase a radiator that is designed not to do this so that I may keep my truck instead of trading it in?
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#2 (permalink) Old 12-10-2012, 02:08 PM
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#3 (permalink) Old 12-10-2012, 02:11 PM
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there is no such thing as a radiator that will not do this at all.....unless you bypass the radiator and use the transmission cooler only.

the risk of contamination exists in all radiators of this type....it may be very very small....but its never 0%.

personally i would get the newest factory radiator...which is supposed to be fixed and move on.....

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#4 (permalink) Old 12-10-2012, 02:18 PM
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What is an ill side-effect of the bypass?
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#5 (permalink) Old 12-10-2012, 02:33 PM
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MAINE, that is the answer I was looking for, I don't know much about radiators so I didn't know that ALL radiators had the chance of doing it unless you do the bypass. Also when you say ALL radiators, does that include trucks with the 6 speed manual or just the auto's.

Lastly, if I decide to keep my truck and do the bypass instead of changing out the radiator, are there any bad side effects of doing this? I only tow a trailer with 2 or 3 fourwheelers a few times a year and thats it.

Thanks for the reply!
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#6 (permalink) Old 12-10-2012, 03:11 PM
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Quote:
Originally Posted by TXPRO4X View Post
MAINE, that is the answer I was looking for, I don't know much about radiators so I didn't know that ALL radiators had the chance of doing it unless you do the bypass. Also when you say ALL radiators, does that include trucks with the 6 speed manual or just the auto's.

Lastly, if I decide to keep my truck and do the bypass instead of changing out the radiator, are there any bad side effects of doing this? I only tow a trailer with 2 or 3 fourwheelers a few times a year and thats it.

Thanks for the reply!
Any radiator that's designed to accommodate the transmission cooler (heat exchanger) inside the radiator *could* cross-contaminate, but an apparent design flaw of the Frontier's radiator made it more prevalent to failure & has supposedly now been rectified.

Typically speaking, most manual transmission vehicles don't have trans fluid coolers, but there are exceptions. I doubt our M/T trucks have one, if they do, I'm sure someone will come along and correct me.

When someone does a bypass, removing the trans supply and return lines from the radiator and instead run them into and out of a liquid-to-air transmission cooler without a thermostat, it's possible that in certain climates (cold) that the fluid wouldn't reach it's optimal operating temperature, but instead be cooler than designed.

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#7 (permalink) Old 12-10-2012, 03:16 PM
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Originally Posted by TXPRO4X View Post
MAINE, that is the answer I was looking for, I don't know much about radiators so I didn't know that ALL radiators had the chance of doing it unless you do the bypass. Also when you say ALL radiators, does that include trucks with the 6 speed manual or just the auto's.

Lastly, if I decide to keep my truck and do the bypass instead of changing out the radiator, are there any bad side effects of doing this? I only tow a trailer with 2 or 3 fourwheelers a few times a year and thats it.

Thanks for the reply!
do not believe the manual transmission is effected because it does not use the cooler.....somebody please correct me if i am wrong.....

people are concerned about bypassing for 2 reasons.....

1. transmission fluid does not warm up quick enough in cold weather....not getting heat from the engine coolant.....

2. the radiator is more efficient at cooling than the tranny cooler so things that place a high heat load on the tranny could be damaging with the bypass...i.e. towing....


how much either of these issues are real i do not know...

personally i have had my 05 pathfinder bypassed now for a couple of years....i tow in the summer on most weekends....and drive it in Maine winters.........no issues yet.

i will be replacing the radiator this spring with the latest factory radiator and will not look back.....

2012 Frontier KC SV V6 4x4....2005 Pathfinder V6 4x4
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#8 (permalink) Old 12-10-2012, 08:54 PM
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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 ?
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#9 (permalink) Old 12-10-2012, 09:09 PM
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You can do the bypass and add a tranny cooler. And as for as wear and year with just the bypass alone, I know of numerous xterras that have done the bypass and wheel the hell out of them with no issues.

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#10 (permalink) Old 12-10-2012, 09:13 PM
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lots of radiators, even griffins can include a built in tranny cooler as an option.

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