yes we realise this -I wasn't talking about "creating" the heat in the Auto Transmission - but dissipating the said heat in the Auto Transmission
however, after re-reading this whole thread, I have realised that we were talking about 2 separate issues that were in this same tread.
your question
was best answered in this post #71
however, I am talking about post #61 and #67
about fitting an aftermarket external additional cooling radiator for the oil.
your original question
was in fact answered by Nissannewby - the coolant runs through the oil filter housing - thus taking heat from the oil, transferring it to the coolant, and then on through the rest of the cooling system ie: thermostat, water pump and radiator.