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Discussion Starter · #1 ·
I just removed the radiator on a junked Pilot I own to see if I could use it on my current one, and the ATF cooling line fittings on the radiator were corroded to shit. So now I'm scared about my current vehicle, as I can't really even get a good view of how bad it may be.

My question is this: can I just bypass the built-in ATF cooler on the radiator? That way I don't have to worry about those fittings failing and ruining my transmission. They may fail and I mix ATF with coolant, but that's better than losing the tranny as well.

The only thing I can think of as to why not to do it, is that there is a sensor in that section that I don't want to bypass. Thoughts?

--Chris N.
 

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Attached is a picture of my old versus new radiator. The Denso replacement was approx $100 and is thicker than the OEM. Swapping radiators is not super ez like the old days so I’d prefer to do it once ever 10-15 yrs. If the trans lines are rusty the radiator might not be far behind. One DIY idea is to use a properly secured rubber hose in place of the external metal tube.
In regards to your question and IMO the factory radiator cooler has a role in both cooling and maintaining proper trans operation temps that may be MIA with running just an auxiliary trans cooler. For example in cold climates the trans fluid may not warm up as quickly as the engine warms up or proper cooling may not occur as triggered by various sensors etc
 

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Nobili spiritus embiggens pequeño sparus tyre.
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Looks like I'll be ordering a new radiator. I assume that the DENSO 2213232 from RockAuto is recommended here?

--Chris N.
For a 2003 to 2005, yes, assuming that's what you have by looking at your avatar.

More Information for DENSO 2213232


I changed the upper and lower hoses, as well as the thermostat when I did min last winter.


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2016 CRV Touring AWD, 2005 Pilot RIP.
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To answer your original question, you have a nominal atf cooler already in front of the radiator. Passing the atf through the radiator is common practice today.
 

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Discussion Starter · #6 ·
Thx for the comments, everyone. I just received a new Denso radiator and plan on installing it this weekend.

For $120 + elbow grease, it didn't make sense to gamble on my current radiator.

--Chris N.
 

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I just removed the radiator on a junked Pilot I own to see if I could use it on my current one, and the ATF cooling line fittings on the radiator were corroded to shit. So now I'm scared about my current vehicle, as I can't really even get a good view of how bad it may be.

My question is this: can I just bypass the built-in ATF cooler on the radiator? That way I don't have to worry about those fittings failing and ruining my transmission. They may fail and I mix ATF with coolant, but that's better than losing the tranny as well.

The only thing I can think of as to why not to do it, is that there is a sensor in that section that I don't want to bypass. Thoughts?

--Chris N.
The Tru-Cool Max tranny cooler could be a viable option. Seems like late model Pilots and FWD Ridgeline's have no factory tranny cooler at all so adding an oil to air tranny cooler located in front of the a/c condenser would be beneficial. I installed one on our FWD Ridgeline and it dropped TFT 35-40 degrees.:)

 

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Attached is a picture of my old versus new radiator. The Denso replacement was approx $100 and is thicker than the OEM. Swapping radiators is not super ez like the old days so I’d prefer to do it once ever 10-15 yrs. If the trans lines are rusty the radiator might not be far behind. One DIY idea is to use a properly secured rubber hose in place of the external metal tube.
In regards to your question and IMO the factory radiator cooler has a role in both cooling and maintaining proper trans operation temps that may be MIA with running just an auxiliary trans cooler. For example in cold climates the trans fluid may not warm up as quickly as the engine warms up or proper cooling may not occur as triggered by various sensors etc
i think Denzo transmission connections are the same material as the radiator to prevent dissimilar metal corrosion as well?
 

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i think Denzo transmission connections are the same material as the radiator to prevent dissimilar metal corrosion as well?
One would hope they've learned from the error of their ways.
 

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Wonder if Honda told Denso what materials to use?
 

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Nobili spiritus embiggens pequeño sparus tyre.
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Wonder if Honda told Denso what materials to use?
I'm sure an engineering team was summoned to a ごめんなさい session at some point.
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