Originally Posted by zzkazu
Has anybody verified the transmission EVIC temperature via another sensor?
Yes. Certainly have.
I tow a 3 Tonne van, a lot, here in Australia.
I always run an OBDII wifi with OBDFusion running on my iPhone or iPad, when towing, monitoring engine temp, oil temp, gearbox temp , cat temp and DPF level, on either the EVIC or app.
The figures on the app are the same as on the EVIC screen.
Gearbox temp: it runs hotter than many others, and I'm sure it's designed to do so. Once it warms up, it sits around 92-95 Celsius (close to 200F) pretty much ALL the time.
I can descend a range, and it's still over 90.
I can climb a range, and it's usually still mid to high 90's. I haven't seen very much over 100 (212F) ever yet -Obviously thermostatically controlled and works very well. I wouldn't lose sleep over it, but will continue to monitor it, and will consider backing off only if I see it way hotter perhaps on a very hot day climbing hills. It's an awesome gearbox, love it, but I won't be leaving it "sealed for life". I'll spend the money to do a fluid change at maybe at 40-50,000 klms and subsequent changes maybe a bit higher klms. (A new gearbox will ALWAYS generate metal from new, but this one has a very good internal filter in the pan.)
COOLANT temp, and engine oil temp. Again, the engine runs hot, is designed to do so, and the gauge is very active, not damped down like many other makes.
The thermostat only opens around 95-97C and that's the coolest I see after that, even down hill, and although the gauge rapidly rises up a hill, it settles up near the top of the normal band with no sign of going further. I've seen about 125C on the oil towing up big climbs, which then rapidly falls back to about 95-100 on the flat.
As I said, those figures are all towing 3T, so don't worry. These high tech synthetic oils will handle the temps I'm seeing with ease.