Moderator: volvite
Did you get rid of the factory auxiliary cooler? It looks small but is very effective. If you put in aftermarket, it may not have the same hear rejection rate as the factory cooler. Most aftermarket coolers I've seen are no where near as good as the factory cooler we have.aussie370 wrote:Thanks for the suggestions. I never thought about a crimped hose or restrictive flow.
@disallow Yes sir I have a bypass. One of the first things I checked when I read about the problem. When they rebuilt the transmission they mentioned there was no evidence of water mixing with the ATF.
In all honesty I don't know. When I arrived up here in Phoenix from Boston I needed to upgrade a few parts and that's when I asked about the bypass. They mentioned it was already done into a small black external one (overheating was occurring). I asked for an oversized cooler (overheating still occurring) even after the transmission being rebuilt.disallow wrote: Did you get rid of the factory auxiliary cooler? It looks small but is very effective. If you put in aftermarket, it may not have the same hear rejection rate as the factory cooler. Most aftermarket coolers I've seen are no where near as good as the factory cooler we have.
Also, if you've replaced your rad, I'd consider undoing the bypass.
I think there was info on someone asking if their radiator was original or already replaced somewhere in this forum.aussie370 wrote:In all honesty I don't know. When I arrived up here in Phoenix from Boston I needed to upgrade a few parts and that's when I asked about the bypass. They mentioned it was already done into a small black external one (overheating was occurring). I asked for an oversized cooler (overheating still occurring) even after the transmission being rebuilt.disallow wrote: Did you get rid of the factory auxiliary cooler? It looks small but is very effective. If you put in aftermarket, it may not have the same hear rejection rate as the factory cooler. Most aftermarket coolers I've seen are no where near as good as the factory cooler we have.
Also, if you've replaced your rad, I'd consider undoing the bypass.
The transmission was slipping. I would see the RPM needle fluctuate and at times see it sitting at 5K - 6K while cruising. So I guess I assumed it was the transmission.
So I really have no idea whether the radiator is the original or has been replaced. I purchased the Pathfinder about 4 years ago and it wasn't until I arrived up here that I learnt about problem.
Interesting that you mentioned aftermarket coolers. I will look into that as well. I'm taking the Pathy to the shop tomorrow to check the hoses etc. They are perplex as I am and want a solution.
Thanks. I thought about that, but at this stage I just want to eliminate the problem.Thupertrooper wrote: I think there was info on someone asking if their radiator was original or already replaced somewhere in this forum.
I second the aftermarket trans cooler might not be working as it should.
If i had to redo mine i would go with CSF aluminum radiator so i could run the trans lines to it.
how can you be sure the trans is actually overheating?aussie370 wrote:I am at a complete loss.
The external after market cooler removed and another Nissan radiator installed. The transmission still overheating.
Is 190 Celsius or Fahrenheit degrees? If it's 190 degrees F., that's normal operating temperature for transmission fluid.aussie370 wrote:I have the Bully Dog installed.
I thought about the sensor but the transmission runs at around 190 in town. It is just under load (400 - 500lbs in the back) when going up long steep hills.