I by-passed my in radiator tranny cooler

The Gas and Diesel Engines - VQ40De, VK56DE, YD25DDTi, V9X, Transmission, Transfer Case, Oil, Differentials, Axles, Exhaust...

Moderator: volvite

claytormatt
Posts: 3
Joined: Mon Jul 25, 2022 1:47 pm

Re: I by-passed my in radiator tranny cooler

Postby claytormatt » Mon Jul 25, 2022 1:52 pm

Buying a 2010 one owner with 76K on the odometer Radiator and Transmission was replaced at 52K , will that have solved the problem or should I do the bypass ?


User avatar
palmerwmd
Site Admin
Posts: 2343
Joined: Tue Jan 31, 2017 4:45 am
Location: Mid Atlantic

Re: I by-passed my in radiator tranny cooler

Postby palmerwmd » Mon Jul 25, 2022 3:31 pm

claytormatt wrote:
Mon Jul 25, 2022 1:52 pm
Buying a 2010 one owner with 76K on the odometer Radiator and Transmission was replaced at 52K , will that have solved the problem or should I do the bypass ?
No actions required on your part.
Since the replacement was done well after the bad rads were made it is near certain you have a good one.
New transmission also nice to have ( though these transmisison are strong and not at all a problem area, except from SMOD)....and you will likely not new a new one for a very very long long time.
Without SMOD these transmission rarely fail much before 200k, if then.

Limey
Posts: 116
Joined: Fri Jun 17, 2022 5:17 am

Re: I by-passed my in radiator tranny cooler

Postby Limey » Wed Aug 10, 2022 9:59 am

I’m getting the bypass done on my 2009 next week. Is it true that my transmission will be running hotter afterwards ? There seems to be conflicting views about this.

User avatar
VStar650CL
Posts: 501
Joined: Wed Dec 09, 2020 6:19 pm

Re: I by-passed my in radiator tranny cooler

Postby VStar650CL » Wed Aug 10, 2022 2:48 pm

Limey wrote:
Wed Aug 10, 2022 9:59 am
I’m getting the bypass done on my 2009 next week. Is it true that my transmission will be running hotter afterwards ? There seems to be conflicting views about this.
That depends enormously on how you drive and the conditions you drive in. The heat exchanger and radiating cooler don't work the same way. The cooler will have a relatively steady temperature from idle to near-maximum engine output, and heat transfer in fluid is roughly 27 times better than air. On the other hand, the radiating cooler is very efficient on the highway with forced-air being fed to it, just not so much at low speeds and low engine RPM's. So if you do a lot of stop-and-go or trailering, especially in a hot climate, you probably want to consider a bigger radiating cooler than the stock one.

Limey
Posts: 116
Joined: Fri Jun 17, 2022 5:17 am

Re: I by-passed my in radiator tranny cooler

Postby Limey » Thu Aug 11, 2022 12:11 pm

I don’t tow anything , and not too much stop go traffic. However, I’m situated in a hot climate Florida.

claytormatt
Posts: 3
Joined: Mon Jul 25, 2022 1:47 pm

Re: I by-passed my in radiator tranny cooler

Postby claytormatt » Tue Sep 06, 2022 7:13 am

thanks !! I did not see your reply :-) The new radiator and transmission were installed by the dealer in 2017, so hopefully all the old stock had been depleted! :lol:

User avatar
VStar650CL
Posts: 501
Joined: Wed Dec 09, 2020 6:19 pm

Re: I by-passed my in radiator tranny cooler

Postby VStar650CL » Tue Sep 06, 2022 8:06 am

claytormatt wrote:
Tue Sep 06, 2022 7:13 am
The new radiator and transmission were installed by the dealer in 2017, so hopefully all the old stock had been depleted! :lol:
If you bought it from Nissan, they pretty much junked old stock on those radiators as soon as improvements came out. So anything OE past early '11 is pretty much guaranteed to be the good design. Aftermarket can be a different story, but the majority of brand-name aftermarket replacements never had SMOD issues in the first place.


Return to “R51 Engine, Driveline and Powertrain”