Moderator: volvite
BigEz wrote:I think many people get confused (I did) and think the bypass takes out the transmission cooler. It does not. The radiator has a built-in transmission heater..(not a cooler). This helps get the Trans temp up when first started.
This built-in heater is what leaks. You are bypassing this heater. The Trans cooler is a separate unit mounted in front of radiator, and is not effected by bypass. If that helps...
The simple instructions I have given to everyone I meet is:Done...Bypassed
- On the the bottom of your Radiator there are two rubber transmission hoses connected to the radiator with clamps.
They are the only two, the radiator has no other transmission hoses connected.
Disconnect them from the Radiator and connect them together.
Secure hose.
doctahjones has a good picture:
http://www.thenissanpath.com/viewtopic. ... 0400#60400
In theory let's say your Trans temp was 212 deg/F and your Water was 200, then yes I suppose it would act as a "pre-cool" before the Trans fluid went through dedicated cooler. But from what I have read, it's main purpose is to warm the Trans fluid to operating temp quicker, so that the transmission shifts proper and activates overdrive (5th gear) sooner. Thus improving gas mileage and (my guess)helps at getting a better MPG number on the original sticker.DirtDgr wrote:
Ok just did it and then came in to see if I did it right. The pics in your link are great. Thanks.
Everything looks clean and oil looks good.
So what we are bypassing is a heater, not a cooler. What if trans temps surpass radiator temps? Is that possible and would it help cooling at that point?
I tow a lot and have no problem with adding cooling. But do I need too?
Yes, I would 100% agree with that... Although I seldom saw 175 deg F or higher under normal driving conditions prior to bypass. 165 deg was my rock solid norm. Post bypass it's 157 deg.smj999smj wrote: First of all, it is still called a "cooler," though it does function to warm the ATF in times when it is too cold, as well as cool the ATF when the fluid is too hot. It's primary job is to maintain the ATF temperature around 175-210 degrees F.