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.

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.

I have 2018 Suburban with 6L80 Trans. Recently started seeing temperatures as high as 270F with normal driving on highway or even around town after an hour of driving. I am wondering if this is a Trans temperature sensor problem. The trans cooler lines into and out of the radiator are at 150F. So my thinking is one of the following. 1) Thermal bypass valve malfunction, 2) Clogged or partially clogged trans cooler lines, 3) malfunction in the report of the temperature. I intend to replace with the newer 85585333 GM bypass valve. But I am wondering if anyone else has experienced this situation. I can't find anything on the internet about temps for this trans this high.