2018 Suburban Radiator provide cooling of transmission fluid

[SLC2]

I have 2018 Suburban with 6L80 Trans and 5.3L engine. I am chasing a high temperature problem for the transmission. I am wondering if all such suburbans have passages in the radiator to cool the transmission fluid. I was trying to get a temperature reading with a infrared temp gun off of the trans lines into the radiator and could not find the  the trans lines into the radiator. I know that on some 2018 suburbans there are trans lines into the left side of the radiator, but I can't find such lines on my Suburban. So what I am looking for is definitive confirmation that some suburbans do not have transmission fluid lines into the radiator.

[davester]

Maybe look on the transmission to see if the trans cooler lines are present there, then follow them forward?

[SLC2]

Thanks. On my suburban there are no external trans fluid lines. From what I can deduce by exploring different radiators for the 2018 suburban, there is the high capacity towing package which includes transmission fluid cooling and engine oil cooling via a single high capacity radiator. Without the high capacity towing package the radiator only cools the engine oil. Basically this is what I want to confirm. Really trying to determine if any 2018 suburban cooling system came from the factory with a cooling radiator that is external to the coolant radiator.  

[davester]

from looking at the parts for an '18 5.3 or a 6.0 burb on rockauto, it doesn't show a separate oem trans cooler like the trucks have.

[SLC2]

Thanks. I saw that also, but wondered if Rockauto just was not selling the factory trans cooler. So, I have looked at a bunch of suburban radiator installations one YouTube and none mention an external factory trans cooler. Evidently the max towing package cools both engine oil and trans fluid through a HD radiator.

[davester]

Have you already dealt with the trans thermostat, which I think your burb might have?  I know the trucks have one that keep the trans temp higher.