Postby smj999smj » Thu Sep 12, 2019 11:24 pm
The first thing you need to know is that the procedure for 2005 through 2007 is different, and simpler, than that for 2008-2012 because the moved the location of the auxiliary trans cooler from the right side to the left (like on yours).
On 2008 and later, you'll need about 2' of 5/16" (or 8mm) transmission cooler hose, two 5/16" caps and some miniature hose clamps. Some also gets some Kooler Kleaner or brake cleaner to clear out the ATF in the cooler line before they install the 5/16" caps (with clamps) on the radiator's cooler line fittings.
In your #3 pic, the hoses are mislabeled. The hose circled in red is actually the return hose from the radiator to the transmission...and this hose is eliminated and the fitting is capped off. The hose you have circled in yellow is actually the hose going from the transmission to the auxiliary cooler...and this hose is left alone.
In your #2 pic, the hose you have circled in red is the cooler hose going from the auxiliary cooler to the radiator. If you follow the hose up a little, you can see a couple of clamps where there is a union in the hose. So, this hose is disconnected from the radiator fitting (which is capped off) and disconnected from the union. This hose is eliminated.
Now, the brand new cooler hose is connected and clamped to the union fitting, which is on the radiator's left side. The new cooler hose is now routed to the trans cooler metal line remaining on the right side of the vehicle, trimmed to the proper length and clamped. You can use a plastic tie strap or two to secure the hose in position, as needed.
Now, all you have to do is clean up the mess, start the engine and check the trans fluid level (top off, as needed...but, in most cases you won't) and then re-install the skid plate after confirming there are no leaks. Done.
So, to help you understand the flow path as it came from the factory, the ATF exits the transmission and goes to the auxiliary cooler. The ATF passes through the auxiliary cooler and goes to the left side of the vehicle where it follows a hose along the side of the radiator which connects to the left cooler fitting on the radiator. The ATF then flows through the integral trans cooler inside the bottom tank of the radiator and exits via the cooler line fitting on the right side of the radiator. It then goes back to the transmission where the ATF is dumped back into the trans pan.
As far as determining if your radiator has been replaced, the factory-installed, Calsonic radiators have a sticker with a part number at the very top of the radiator's top tank, on the left (or driver's side) of the radiator cap. There will be a 10-digit part number on the sticker, starting with "21460-." On the 2008's, you'll likely see part numbers 21460-EA265 or EA215 or 21460-9CA2E (if it was an early replacement). "NISSAN" will also be molded in the right side of the top radiator tank, although you have to look for it because it doesn't stand out. If you have a radiator with no sticker on the top tank, it is most likely an aftermarket replacement. If it has a Calsonic sticker with another number on it, it is likely a replacement, but it may or may not be a radiator that has been affected by the issue, which depends when it was installed. In that case, post the part number and I can help you further. If it is an aftermarket replacement or a Nissan "Value Line" replacement part, you should be in good shape as they have not been affected by the cooler failure issue.
Personally, my preference is to replace the radiator rather than bypass, but each method has its pros and cons.