Scangauge 2 ATF Temp

jemmie

Original poster
Member
Jan 7, 2012
49
I have a 2005 Envoy 4.2L 4x4 with an additional ATF cooler and put in the X-Gauge code for the AT temperature. When engine is cold, temperature is teh same as ambient and seems reasonable. When vehicle is running, temperature never goes above about 115F.

A few questions:

1) Does anyone else have this setup with Scangauge and have other data points?
2) Where is the ATF temp sensor? I guess it's possible the temperature never gets above 115F (and it's winter here in Indiana) if the sensor is at the incoming from the radiator.

Thanks!
 

Bartonmd

Member
Nov 20, 2011
545
The trans temp it's reading is somewhere inside the valve body, but it's basically sump temp. It's more likely that you have an aux transmission cooler on the thing, that doesn't have a cold bypass, and is over-cooling the transmission. 160-220F is where you want it to be. Long winter highway trips may not get to 160F, but any kind of city/rural driving of more than ~20 miles should have it around 160F, at least, stock...

Mike
 

jemmie

Original poster
Member
Jan 7, 2012
49
I have a B&M 70264 cooler but it supposedly has a "LPD" low pressure drop bypass for oil to flow thru when temperature is low.
 

Bartonmd

Member
Nov 20, 2011
545
Gotcha... They do flow less through the cooler when it's cold, but it's just a "path of less resistance" thing, not a real "thermostat", so it is still cooling, even at low temps...

Mike
 

Instrumental

Member
Jan 29, 2012
268
This is why I've never understood why you would want to mount the cooler after the radiator, particular where it gets cold out. A pre-radiator installation would seem to take load off of the radiator when heat is an issue, and let the radiator bring it to the right temp in a cold situation.

Just my .02
 

fishsticks

Member
Nov 21, 2011
433
I don't have an aux cooler.

My trans temp generally follows the engine temp. Usually no more than 10 degrees higher. So around 180-200.

Highest I have seen is 237 in the summer (90*) and under load. It also heats up if I'm wheeling.
 

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