I have read a few posts about the reading of the transmission temp and still haven't found a solid answer (or is it, it's not the answer I want ).

Where is this temp being read from? If I read on my Edge a trans temp of 152*, it that the hottest the fluid is? Or should I add another 20* - 30*?

Does this differ from the Scangauge II?

 

I'm going to give you a half-baked answer, because I'm not really sure where the sensor is myself. I THINK it's in the area of the fluid reservoir (you drop the pan to get at it if I'm right). It's probably not the hottest place for it to be located, but it's not the coolest either.

Regardless, the temperature sensor is not there to warn you of a hot transmission, it's there to provide data to the PCM so that it can adjust line pressures and make similar adjustments in the transmission in response to the change in viscosity that occurs as the fluid heats. Being able to monitor this temperature is just a fortunate side effect of having a gauge device.

And yes, the Scangauge gets its information from the same place as the Edge - from the PCM, via the TFT sensor.

I honestly would not worry about adding anything to the temperature you see on the gauge. I'd take the temperature reading as "representative" of the whole fluid supply, which obviously has hotter and colder areas.

- Jack

 

I read in another thread (possibly on another forum) that the sensor is in the internal wiring harness to the shift solenoids, in the valve body.

I'd also agree that it's more of an average temperature, the fluid will be at it's hottest just out of the converter, and probably the coolest in the pan.

 

if truck has the oem aux trans cooler-fluid would be coolest coming out of that